What is 8/36 plus 5/21? (Answer: 29/63)

Exact Answer

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Problem: What is 8/36 plus 5/21?
Formula / Expression: 8/36 + 5/21
Final Answer: 29/63
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Step-by-Step Solution:

Step 1: Find the Least Common Denominator (LCD)
The denominators 36 and 21 share a common factor (GCD = 3). Finding their Least Common Multiple gives an LCD of 252 (which is smaller than their product 36 × 21 = 756, keeping the calculation simpler).
Working: LCD(36, 21) = 252

Step 2: Convert to Equivalent Fractions with Common Denominator 252
Multiply the numerator and denominator of 8/36 by 7, and multiply the numerator and denominator of 5/21 by 12 so both fractions share the common base 252.
Working: 8 × 7/36 × 7 = 56/252 and 5 × 12/21 × 12 = 60/252

Step 3: Add the Numerators
Now add the numerators (56 + 60 = 116) and keep the common denominator 252 unchanged.
Working: 56 + 60/252 = 116/252

Step 4: Simplify the Fraction to Lowest Terms
Find the Greatest Common Divisor (GCD) of 116 and 252, which is 4. Divide both the numerator and denominator by 4.
Working: 116 ÷ 4/252 ÷ 4 = 29/63

Step 5: Decimal & Percentage Representation
Dividing the numerator 29 by denominator 63 produces a repeating decimal (approximately 0.460317, or 46.0317%).
Working: 29 ÷ 63 = 0.460317 (46.0317%)

Key Values:
- Simplified Fraction: 29/63
- Mixed Number Form: 29/63
- Decimal Value: 0.460317
- Percentage: 46.0317%

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Solved with FractionsCalc:
https://fractionscalc.com/what-is-8-36-plus-5-21/
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8/36 + 5/21 = 29/63

Simplified Fraction

29/63

Mixed Number

Proper (29/63)

Decimal Value

0.460317

Percentage

46.0317%

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Step-by-Step Solution: 8/36 + 5/21

Step 1

Find the Least Common Denominator (LCD)

The denominators 36 and 21 share a common factor (GCD = 3). Finding their Least Common Multiple gives an LCD of 252 (which is smaller than their product 36 × 21 = 756, keeping the calculation simpler).

LCD(36, 21) = 252

Step 2

Convert to Equivalent Fractions with Common Denominator 252

Multiply the numerator and denominator of 8/36 by 7, and multiply the numerator and denominator of 5/21 by 12 so both fractions share the common base 252.

8 × 7/36 × 7 = 56/252 and 5 × 12/21 × 12 = 60/252

Step 3

Add the Numerators

Now add the numerators (56 + 60 = 116) and keep the common denominator 252 unchanged.

56 + 60/252 = 116/252

Step 4

Simplify the Fraction to Lowest Terms

Find the Greatest Common Divisor (GCD) of 116 and 252, which is 4. Divide both the numerator and denominator by 4.

116 ÷ 4/252 ÷ 4 = 29/63

Step 5

Decimal & Percentage Representation

Dividing the numerator 29 by denominator 63 produces a repeating decimal (approximately 0.460317, or 46.0317%).

29 ÷ 63 = 0.460317 (46.0317%)

Visual Representation

The diagram below illustrates 8/36 plus 5/21 visually:

Summary & Alternative Representations

Property / Format	Value
Lowest Terms Fraction	`29/63`
Mixed Number Form	`29/63`
Decimal Form	`0.460317`
Percentage	`46.0317%`

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Frequently Asked Questions

What is 8/36 plus 5/21 as a fraction?

8/36 + 5/21 in simplest fraction form is 29/63.

What is 8/36 plus 5/21 as a decimal?

8/36 + 5/21 converted to a decimal is 0.460317.

What is 8/36 plus 5/21 as a percentage?

8/36 + 5/21 expressed as a percentage is 46.0317%.

Does 8/36 plus 5/21 result in a terminating or repeating decimal?

It results in a repeating decimal (approximately 0.460317...) because the denominator contains prime factors other than 2 and 5.