Ch 2: Arithmetic Expressions — Class 7 Maths

✎ 1. Simple Expressions

An arithmetic expression is a mathematical phrase that combines numbers with operations. Think of it as a compact way to describe a calculation.

➕ Addition

13 + 2 = 15

➖ Subtraction

20 − 4 = 16

✖ Multiplication

12 × 5 = 60

➗ Division

18 ÷ 3 = 6

Every expression has a value — the number it evaluates to. The = sign shows the relationship between an expression and its value.

💡 Key Idea: Different expressions can have the same value! For example, all of these equal 12:
10 + 2 • 15 − 3 • 3 × 4 • 24 ÷ 2

🎬 Multiple Expressions, One Value

10 + 2

15 − 3

3 × 4

24 ÷ 2

↓

= 12

📖 Example 1: Mallika's Lunch

Mallika spends ₹25 every day for lunch from Monday to Friday.

Expression: 5 × 25 = 125

So Mallika spends ₹125 on lunch in a week.

💡 Remember: An expression is a mathematical phrase, not a sentence. It doesn't have an = sign by itself. When we write "5 × 25 = 125", the left side (5 × 25) is the expression, 125 is its value, and = connects them.

⚖ 2. Comparing Expressions

We can compare expressions using >, <, and = by finding their values first.

📖 Example 2: Raja vs Joy — Marble Challenge

Raja has 1023 + 125 marbles. Joy has 1022 + 128 marbles. Who has more?

Raja: 1023 + 125 = 1148

Joy: 1022 + 128 = 1150

Joy has 2 more marbles! So: 1023 + 125 < 1022 + 128

📊 Marble Comparison

Raja
1023+125

1148

Joy
1022+128

1150

Joy has 2 more marbles!

📖 Example 3: Equal Expressions

Compare: 113 − 25 vs 112 − 24

113 − 25 = 88

112 − 24 = 88

They are equal! So: 113 − 25 = 112 − 24

💡 Quick Trick: Sometimes you can compare without fully computing. If one expression adds more and the other starts higher, think about the net difference. Raja starts 1 higher but adds 3 less, so Joy wins by 2.

✏ Figure it Out 1

Q1. Fill in the blanks:

(a) 13 + 4 = + 6

(b) 22 + = 6 × 5

(c) 8 × = 64 ÷ 2

(d) 34 − = 25

Answers: (a) 11 (b) 8 (c) 4 (d) 9

Q2. Arrange in ascending order (smallest to largest):

67 − 19, 67 − 20, 35 + 25, 5 × 11, 120 ÷ 3

Values: 48, 47, 60, 55, 40

Ascending order: 120 ÷ 3 (=40) < 67−20 (=47) < 67−19 (=48) < 5×11 (=55) < 35+25 (=60)

🔎 3. Reading Complex Expressions

When an expression has more than one operation, things can get confusing — just like ambiguity in language!

💬 Language Analogy: "Shalini sat next to a friend with toys." Does Shalini have toys, or does the friend? The sentence is ambiguous! Similarly, 30 + 5 × 4 can be read in two ways.

📖 Example 4: The Big Debate

Expression: 30 + 5 × 4

👧 Purna says:

"Add first! (30 + 5) × 4 = 35 × 4 = 140"

👦 Mallesh says:

"Multiply first! 30 + (5 × 4) = 30 + 20 = 50"

Who is right? Mallesh is correct! By convention, multiplication is done before addition.

🎬 Two Paths, One Correct

30 + 5 × 4

(30+5) × 4

= 35 × 4

= 140 ✘

30 + (5×4)

= 30 + 20

= 50 ✔

💡 Why We Need Brackets & Rules: Without clear rules or brackets, the same expression could give different answers. That's why we use brackets to make the order clear and we have the convention that multiplication/division is done before addition/subtraction.

📎 4. Brackets in Expressions

Rule: Always evaluate expressions inside brackets first!

📖 Example 5: Irfan's Shopping

Irfan buys biscuits for ₹15 and toor dal for ₹56. He pays ₹100.

Correct: Change = 100 − (15 + 56) = 100 − 71 = ₹29

Wrong way: 100 − 15 + 56 = 85 + 56 = 141 ✘ (Absurd! More than he paid!)

🎬 Bracket Resolver

100 − (15 + 56)

100 − 71

= 29 ✔

💡 Think of brackets as a box: Whatever is inside the box must be solved first before you can use the result in the rest of the expression.

🔥 5. Terms in Expressions

Terms are the parts of an expression separated by the + sign.

Subtracting is the same as adding the inverse:

83 − 14 = 83 + (−14)

So the terms of 83 − 14 are: 83 and −14

➖ Subtraction as Addition

−18 − 3 = (−18) + (−3)

Terms: −18 and −3

✖ Multiplication within a Term

6 × 5 + 3

Terms: 6×5 and 3

6×5 is a single term!

💡 Important: A product like 6 × 5 counts as a single term because there is no + sign inside it. The + sign is what separates terms.

🎬 Term Identifier

23 − 2×4 + 16

📌 Identify the Terms

Click "Reveal" to see the terms for each expression:

Expression	Terms
13 − 2 + 6	13, −2, 6
5 + 6×3	5, 6×3
4 + 15 − 9	4, 15, −9
23 − 2×4 + 16	23, −2×4, 16
28 + 19 − 8	28, 19, −8

🔄 6. Swapping & Grouping

🔁 Commutative Property

Swapping terms doesn't change the sum.

📖 Example 6: Drone Flight

A drone goes 6 m up and then 4 m down.

Expression: 6 + (−4) = 2

Swap the terms: (−4) + 6 = 2

Same result! ✔

🎬 Commutative Swap

6

+

(−4)

=

2

🧰 Associative Property

Grouping terms differently doesn't change the sum.

📖 Example: Different Groupings

Evaluate (−7) + 10 + (−11) in different ways:

Way 1: [(−7) + 10] + (−11) = 3 + (−11) = −8

Way 2: (−7) + [10 + (−11)] = (−7) + (−1) = −8

Way 3: [(−7) + (−11)] + 10 = (−18) + 10 = −8

All give −8!

💡 Key Rule: "In an expression with only additions (remember, subtraction is just adding the inverse), the order of terms doesn't matter."

🔢 Evaluating Expressions with Multiplication

When an expression has multiplication, evaluate each term first, then add.

📖 Example: 30 + 5 × 4

Terms: 30 and 5×4

Step 1: Evaluate 5 × 4 = 20

Step 2: Add: 30 + 20 = 50

💡 Manasa's Problem: Manasa added a long list of numbers and got 11,749. Then she realized she forgot to include 9,055. Does she need to restart? No! She can simply add: 11,749 + 9,055 = 20,804. The associative property saves the day!

🧦 Swapping in Everyday Life: Putting on a hat and shoes — order doesn't matter (commutative!). But putting on socks and then shoes — order matters (not commutative!). In addition, swapping always works.

📖 7. Expressions with Stories

📖 Example 7: Dosa Dinner

A family orders 4 dosas at ₹23 each and gives a ₹5 tip.

Expression: 4 × 23 + 5 = 92 + 5 = ₹97

📖 Example 8: Fire in the Mountain

33 students play "Fire in the Mountain, Run Run Run!" They form groups of 5.

Expression: 6 × 5 + 3 = 30 + 3 = 33

6 complete groups with 3 students left over.

🎬 Fire in the Mountain!

📖 Example 9: Raghu's Packets

Raghu has 4 packets. His mother gives half of 100 more.

Expression: 4 + 100 ÷ 2 = 4 + 50 = 54 packets

📖 Example 10: Kannan's Payment

Kannan pays ₹432 using notes and coins:

Expression: 4 × 100 + 1 × 20 + 1 × 10 + 2 × 1

= 400 + 20 + 10 + 2 = ₹432

📖 Example 11: Grid Arrangements

Which grid matches 5 × 2 + 3?

We need a grid with 5 rows of 2, plus 3 extra = 13 cells

5×2 + 3 = 13 ✔

✏ Figure it Out 2

Q1. Find the values by identifying terms:

(a) 28 − 7 + 8 =

(b) 39 − 2×6 + 11 =

(c) 40 − 10 + 10 + 10 =

(d) 48 − 10×2 + 16÷2 =

(e) 6×3 − 4×8÷5 =

Answers: (a) 29 (b) 38 (c) 50 (d) 36 (e) 11.6

Q2. Write a story for each expression:

(a) 89 + 21 − 10

(b) 5 × 12 − 6

(c) 4 × 9 + 2 × 6

Sample stories:
(a) A shop had 89 items, received 21 more, then sold 10. Total = 100 items.
(b) 5 packets of 12 biscuits, 6 got crushed. Remaining = 54 biscuits.
(c) 4 rows of 9 red chairs + 2 rows of 6 blue chairs = 36 + 12 = 48 chairs.

Q3. Word Problems:

(a) A princess has 5 chests with 20 gold coins each, plus 13 loose coins. How many coins total?

Answer:

(b) A metro ticket costs ₹35. A family of 4 buys tickets but gets ₹10 discount. Total cost?

Answer:

(c) A window is at 12 m height. A ladder reaches 3 m above the window. Ladder length?

Answer: m

Answers: (a) 5×20 + 13 = 113 (b) 4×35 − 10 = 130 (c) 12 + 3 = 15 m

🔓 8. Removing Brackets I

💡 Key Rule: When brackets are preceded by a MINUS sign, the signs of all terms inside CHANGE (+ becomes −, − becomes +). When preceded by a PLUS sign, signs stay the same.

📖 Example 12: Minus Before Bracket

100 − (15 + 56)

= 100 − 15 − 56

= 29

📖 Example 13: Be Careful!

500 − (250 − 100)

= 500 − 250 + 100 (the − flipped to +!)

= 350

NOT 500 − 250 − 100 = 150 ✘

📖 Example 14: Plus Before Bracket

28 + (35 − 10)

= 28 + 35 − 10 (signs stay the same!)

= 53

🎬 Sign Flipper

500 − (+250 −100)

↓ minus flips the signs! ↓

500 −250 +100

= 350

🔧 Tinker the Terms I

How does changing one term affect the value?

If 53 + (−16) = 37, what is 54 + (−16)?

Answer:

38 (one more than 37, because 54 is one more than 53)

If 53 + (−16) = 37, what is 53 + (−17)?

Answer:

36 (one less, because we are subtracting 1 more)

If 53 + (−16) = 37, what is 55 + (−18)?

Answer:

37 (53 increased by 2, 16 increased by 2 — net change is 0!)

✏ Figure it Out 3

Q1. Fill in the blanks:

(a) 38 − (−7) = 38 + =

(b) 17 + (−3) = 17 − =

(c) (−22) + 18 = 18 − =

Answers: (a) 7, 45 (b) 3, 14 (c) 22, −4

Q2. Remove brackets:

(a) 13 − (6 + 3) =

(b) 13 − (6 − 3) =

(c) 13 + (6 + 3) =

(d) 13 + (6 − 3) =

(e) −(18 + 5) =

(f) −(18 − 5) =

Answers: (a) 13−6−3=4 (b) 13−6+3=10 (c) 13+6+3=22 (d) 13+6−3=16 (e) −18−5=−23 (f) −18+5=−13

Q3. Compare each pair:

(a) 43 − (12 + 9) vs 43 − 12 − 9 →

(b) 43 − (12 − 9) vs 43 − 12 − 9 →

Answers: (a) = (both equal 22) (b) > (40 vs 22)

Q5. Add brackets to get the indicated values:

(a) 16 − 4 + 2 = 10 → Write with brackets:

(b) 3 + 2 × 4 = 20 →

Answers: (a) 16 − (4+2) = 16−6 = 10 (b) (3+2) × 4 = 5×4 = 20

Q7. Using 2, 3, and 5 with + and −, how many different values can you make?

Try all combinations: 2+3+5, 2+3−5, 2−3+5, 2−3−5, etc.

Possible values:
+2+3+5 = 10, +2+3−5 = 0, +2−3+5 = 4, +2−3−5 = −6
−2+3+5 = 6, −2+3−5 = −4, −2−3+5 = 0, −2−3−5 = −10
Distinct values: −10, −6, −4, 0, 4, 6, 10 (7 values, but 0 appears twice so 6 distinct values)

Q8. Jasoda's Strategy: To subtract 9, she subtracts 10 then adds 1. Why does this work?

Explanation: n − 9 = n − (10 − 1) = n − 10 + 1.
Subtracting 10 is easy (just decrease the tens digit), then add 1 back. This is the bracket-removal rule in action!

🔮 9. Removing Brackets II — Distributive Property

📖 Example 15: Lhamo & Norbu's Hotel Bill

Lhamo and Norbu each order a meal costing ₹43 for food + ₹24 for drink.

Expression: 2 × (43 + 24) = 2 × 67 = 134

OR: 2 × 43 + 2 × 24 = 86 + 48 = 134

Both ways give the same answer!

📖 Example 16: Republic Day Parade

4 rows of soldiers + 3 rows of soldiers, each row has 5 soldiers.

4 × 5 + 3 × 5 = (4 + 3) × 5 = 7 × 5 = 35

💡 Distributive Property:
a × (b + c) = a × b + a × c
"Multiple of a sum = Sum of the multiples"

🎬 Distributive Property — Area Model

a × (b + c)

a × b

a × c

= a×b + a×c

📖 Example 17: Smart Multiplication

Given that 53 × 18 = 954, find 63 × 18.

63 × 18 = (53 + 10) × 18 = 53×18 + 10×18 = 954 + 180 = 1134

📖 Example 18: Mental Math Magic

Calculate 97 × 25 mentally:

97 × 25 = (100 − 3) × 25 = 100×25 − 3×25 = 2500 − 75 = 2425

💡 Power of Distributive Property: It lets us break "hard" multiplications into "easy" ones. 99 × 7 = (100−1) × 7 = 700 − 7 = 693. No long multiplication needed!

🔧 Tinker the Terms II — Mental Math

Use the distributive property to compute:

(a) 102 × 7 =

(b) 98 × 12 =

(c) 999 × 4 =

(a) (100+2)×7 = 700+14 = 714
(b) (100−2)×12 = 1200−24 = 1176
(c) (1000−1)×4 = 4000−4 = 3996

✏ Figure it Out 4

Q1. Use the distributive property:

(a) 3 × (5 + 2) =

(b) 7 × (8 − 3) =

(c) (10 + 4) × 6 =

(d) (20 − 3) × 5 =

(e) 6 × 12 + 6 × 8 = 6 ×

(f) 5 × 17 − 5 × 7 = 5 ×

(g) 101 × 13 =

(h) 99 × 15 =

(i) 48 × 9 =

(j) 52 × 11 =

(k) 4 × 63 + 4 × 37 =

(l) 7 × 84 − 7 × 34 =

(m) 997 × 5 =

(n) 1005 × 8 =

(o) 12 × 45 + 12 × 55 =

(p) 25 × 88 =

(a) 21 (b) 35 (c) 84 (d) 85 (e) 20 (f) 10 (g) 1313 (h) 1485 (i) 432 (j) 572 (k) 400 (l) 350 (m) 4985 (n) 8040 (o) 1200 (p) 2200

Q2. Compare using <, >, or =

(a) 3×(4+5) vs 3×4+5 →

(b) 8×(7−2) vs 8×7−2 →

(c) 5×9+5×1 vs 5×(9+1) →

(d) 6×(10−3) vs 6×10−3 →

(a) > (27 vs 17) (b) < (40 vs 54) (c) = (50 vs 50) (d) < (42 vs 57)

Q3. Write 14 in the form ___ × ( ___ + ___ )

Answer:

Multiple answers: 2 × (5+2), 2 × (3+4), 7 × (1+1), etc.

Q4. Write the sum of the array in two different ways:

A grid with 3 rows of 4 and 3 rows of 6:

Way 1: 3×4 + 3×6 = 12 + 18 = 30

Way 2: 3×(4+6) = 3×10 = 30

Both ways use the distributive property and give 30.

📝 10. Figure it Out 5 — Final Exercises

✏ Figure it Out 5

Q1. Real-life word problems:

(a) A vendor has 5 baskets with 24 mangoes each, and gives away 18 mangoes. How many left?

Answer:

(b) Binu saves ₹15 daily. After 10 days, he spends ₹50. How much does he have?

Answer:

(c) A snail climbs 3 m up each day and slides 1 m down at night. After 5 days, how high is it?

Answer: m

(a) 5×24 − 18 = 120 − 18 = 102
(b) 15×10 − 50 = 150 − 50 = 100
(c) 5×3 − 5×1 = 15 − 5 = 10 m (or 5×(3−1) = 5×2 = 10)

Q2. Melvin wrote these stories. Which expression matches each?

(a) "I had 20 chocolates, gave 5 to each of 3 friends."
Expression:

(b) "4 packets of 6 pencils plus 2 loose pencils."
Expression:

(a) 20 − 5×3 = 20−15 = 5 (b) 4×6 + 2 = 24+2 = 26

Q3. Evaluate 1−2+3−4+5−6+7−8+9−10 in different ways:

Way 1: Group pairs: (1−2)+(3−4)+(5−6)+(7−8)+(9−10) = (−1)+(−1)+(−1)+(−1)+(−1) = −5

Way 2: Group differently: 1+(−2+3)+(−4+5)+(−6+7)+(−8+9)−10 = 1+1+1+1+1−10 = −5

Way 3: Positives: 1+3+5+7+9 = 25. Negatives: 2+4+6+8+10 = 30. Total: 25−30 = −5

Q4. Compare each pair using <, >, =

(a) 28+32 vs 28+33 →

(b) 45−19 vs 45−20 →

(c) 7×8 vs 7×6+7×2 →

(d) 3×(5+2) vs 3×5+2 →

(e) 100−(30+20) vs 100−30+20 →

(f) 50−(25−10) vs 50−25−10 →

(g) 9×(8+3) vs 9×8+9×3 →

(h) 12×5−4 vs 12×(5−4) →

(a) < (b) > (c) = (d) > (21 vs 17) (e) < (50 vs 90) (f) > (35 vs 15) (g) = (99 vs 99) (h) > (56 vs 12)

Q5. Identify equal expressions (same value):

A: 8×6+8×4 • B: 8×(6+4) • C: 8×10 • D: 80 • E: 8×6+4

A = B = C = D = 80. Expression E = 52 (different because 4 is not multiplied by 8).

Q6. Create 10 different expressions that all equal 24:

Some possibilities:
20+4, 30−6, 12×2, 48÷2, 8×3, 6×4, 25−1, 12+12, 100−76, 3×(5+3)

🚀 11. Expression Engineer

Put your expression skills to the ultimate test!

🏆 Challenge 1: Three 3's

Using exactly three 3's and any operations (+, −, ×, ÷, brackets), make as many different values as possible.

Example: 3 + 3 + 3 = 9, 3 × 3 + 3 = 12, 3 × 3 × 3 = 27, 3 × 3 − 3 = 6, (3 + 3) × 3 = 18

🏆 Challenge 2: Four 4's

Using exactly four 4's and any operations, try to make every number from 1 to 20.

1 = 44 ÷ 44

2 = 4 ÷ 4 + 4 ÷ 4

3 = (4 + 4 + 4) ÷ 4

4 = 4 + 4 × (4 − 4)

5 = (4 × 4 + 4) ÷ 4

6 = 4 + (4 + 4) ÷ 4

7 = 4 + 4 − 4 ÷ 4

8 = 4 + 4 + 4 − 4

9 = 4 + 4 + 4 ÷ 4

10 = (44 − 4) ÷ 4

12 = 4 × (4 − 4 ÷ 4)

15 = 4 × 4 − 4 ÷ 4

16 = 4 × 4 + 4 − 4

17 = 4 × 4 + 4 ÷ 4

20 = 4 × (4 + 4 ÷ 4)

🏆 Challenge 3: Using 1, 2, 3, 4, 5

Using digits 1, 2, 3, 4, 5 exactly once each with +, −, try to get every value from −10 to +10.

🏆 Challenge 4: Century Express

Using digits 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 exactly once each, make an expression that equals 100.

🎯 12. Practice Zone

✅ Multiple Choice Questions

1. What is the value of 5 + 3 × 2?
- 16
- 11
- 13
- 10
✔ Answer: 11 (multiply first: 5 + 6 = 11)
2. What is 100 − (30 + 25)?
- 95
- 55
- 45
- 5
✔ Answer: 45 (bracket first: 100 − 55 = 45)
3. The terms of 8 − 3×2 + 5 are:
- 8, −3×2, 5
- 8, −3, 2, 5
- 8, 3×2, 5
- 8−3, 2+5
✔ Answer: 8, −3×2, 5 (3×2 stays together as one term)
4. Which property says a × (b + c) = a×b + a×c?
- Commutative
- Distributive
- Associative
- Identity
✔ Answer: Distributive Property
5. 50 − (20 − 8) equals:
- 22
- 42
- 58
- 38
✔ Answer: 38 (bracket: 50 − 12 = 38)
6. 99 × 7 using distributive property equals:
- 700 + 7
- 700 − 3
- 700 − 7
- 693 + 7
✔ Answer: 700 − 7 = 693 [(100−1)×7 = 700−7]
7. When a minus sign is before a bracket, the signs inside:
- Change (flip)
- Stay the same
- All become positive
- All become negative
✔ Answer: Change (+ becomes −, − becomes +)
8. Which pair of expressions are equal?
- 3×(4+5) and 3×4+5
- 3×(4+5) and 3×4+3×5
- 3+4×5 and (3+4)×5
- 3−(4+5) and 3−4+5
✔ Answer: 3×(4+5) = 3×4+3×5 = 27 (distributive property)
9. The value of 4 + 100 ÷ 2 is:
- 52
- 202
- 54
- 48
✔ Answer: 54 (divide first: 4 + 50 = 54)
10. 15 + (−8) is the same as:
- 15 + 8
- −15 + 8
- −15 − 8
- 15 − 8
✔ Answer: 15 − 8 = 7

✏ Fill in the Blanks

1. An arithmetic __________ is a mathematical phrase combining numbers and operations.

Answer: expression

2. The parts of an expression separated by + are called __________.

Answer: terms

3. a × (b + c) = a×b + a×c is called the __________ property.

Answer: distributive

4. Swapping terms in addition gives the same result due to the __________ property.

Answer: commutative

5. 83 − 14 can be rewritten as 83 + __________.

Answer: (−14)

6. When brackets are preceded by a minus sign, the signs inside __________.

Answer: change (flip / reverse)

7. In 30 + 5 × 4, the expression __________ is done first.

Answer: 5 × 4 (multiplication)

8. Changing the grouping of terms in addition does not change the result. This is the __________ property.

Answer: associative

✔✘ True or False

1. 5 + 3 × 2 = 16

False. 5 + 3×2 = 5 + 6 = 11 (multiply first)

2. 100 − (30 + 20) = 100 − 30 − 20

True. Minus before bracket: signs change, so −(30+20) = −30 − 20

3. 50 − (20 − 5) = 50 − 20 − 5

False. 50 − (20−5) = 50 − 20 + 5 = 35. But 50−20−5 = 25.

4. The terms of 6×5 + 3 are: 6, 5, and 3.

False. 6×5 is a single term. The terms are 6×5 and 3.

5. 7 × 98 = 7 × 100 − 7 × 2 = 686

True. Distributive property: 700 − 14 = 686

6. In addition, the order of terms does not matter.

True. This is the commutative property of addition.

📝 Short Answer Questions

1. Why do we need brackets in arithmetic expressions?

Answer: Brackets remove ambiguity by making the order of operations clear. Without brackets, expressions like 30 + 5 × 4 could be interpreted in multiple ways. Brackets tell us which operation to do first.
2. Explain with an example how the distributive property helps in mental math.

Answer: To calculate 98 × 6 mentally: 98×6 = (100−2)×6 = 600−12 = 588. The distributive property breaks a hard multiplication into easy ones.
3. What are the terms of the expression 15 − 3×4 + 2×7?

Answer: The terms are: 15, −3×4, and 2×7. Products within a term stay together.
4. Remove brackets: 200 − (75 − 30 + 15)

Answer: 200 − 75 + 30 − 15 = 140. When a minus is before the bracket, all signs inside flip.
5. Give a real-life example that uses the expression 3 × 45 + 2 × 30.

Answer: Example: "3 shirts cost ₹45 each and 2 pants cost ₹30 each. Total cost = 3×45 + 2×30 = 135 + 60 = ₹195."

Arithmetic Expressions

➕ Addition

➖ Subtraction

✖ Multiplication

➗ Division

🎬 Multiple Expressions, One Value

📊 Marble Comparison

🎬 Two Paths, One Correct

🎬 Bracket Resolver

➖ Subtraction as Addition

✖ Multiplication within a Term

🎬 Term Identifier

🎬 Commutative Swap

🎬 Fire in the Mountain!

🎬 Sign Flipper

🎬 Distributive Property — Area Model

🏆 Challenge 1: Three 3's

🏆 Challenge 2: Four 4's

🏆 Challenge 3: Using 1, 2, 3, 4, 5

🏆 Challenge 4: Century Express

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