What is 7/36 plus 8/21? (Answer: 145/252)

Exact Answer

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Problem: What is 7/36 plus 8/21?
Formula / Expression: 7/36 + 8/21
Final Answer: 145/252
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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 7/36 by 7, and multiply the numerator and denominator of 8/21 by 12 so both fractions share the common base 252.
Working: 7 × 7/36 × 7 = 49/252 and 8 × 12/21 × 12 = 96/252

Step 3: Add the Numerators
Now add the numerators (49 + 96 = 145) and keep the common denominator 252 unchanged.
Working: 49 + 96/252 = 145/252

Step 4: Check if the Fraction Can Be Simplified
The Greatest Common Divisor (GCD) of 145 and 252 is 1, confirming that 145/252 cannot be reduced further—it is already in its simplest irreducible form.
Working: 145/252

Step 5: Decimal & Percentage Representation
Dividing the numerator 145 by denominator 252 produces a repeating decimal (approximately 0.575397, or 57.5397%).
Working: 145 ÷ 252 = 0.575397 (57.5397%)

Key Values:
- Simplified Fraction: 145/252
- Mixed Number Form: 145/252
- Decimal Value: 0.575397
- Percentage: 57.5397%

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Solved with FractionsCalc:
https://fractionscalc.com/what-is-7-36-plus-8-21/
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7/36 + 8/21 = 145/252

Simplified Fraction

145/252

Mixed Number

Proper (145/252)

Decimal Value

0.575397

Percentage

57.5397%

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Step-by-Step Solution: 7/36 + 8/21

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

7 × 7/36 × 7 = 49/252 and 8 × 12/21 × 12 = 96/252

Step 3

Add the Numerators

Now add the numerators (49 + 96 = 145) and keep the common denominator 252 unchanged.

49 + 96/252 = 145/252

Step 4

Check if the Fraction Can Be Simplified

The Greatest Common Divisor (GCD) of 145 and 252 is 1, confirming that 145/252 cannot be reduced further—it is already in its simplest irreducible form.

145/252

Step 5

Decimal & Percentage Representation

Dividing the numerator 145 by denominator 252 produces a repeating decimal (approximately 0.575397, or 57.5397%).

145 ÷ 252 = 0.575397 (57.5397%)

Visual Representation

The diagram below illustrates 7/36 plus 8/21 visually:

Summary & Alternative Representations

Property / Format	Value
Lowest Terms Fraction	`145/252`
Mixed Number Form	`145/252`
Decimal Form	`0.575397`
Percentage	`57.5397%`

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Frequently Asked Questions

What is 7/36 plus 8/21 as a fraction?

7/36 + 8/21 in simplest fraction form is 145/252.

What is 7/36 plus 8/21 as a decimal?

7/36 + 8/21 converted to a decimal is 0.575397.

What is 7/36 plus 8/21 as a percentage?

7/36 + 8/21 expressed as a percentage is 57.5397%.

Does 7/36 plus 8/21 result in a terminating or repeating decimal?

It results in a repeating decimal (approximately 0.575397...) because the denominator contains prime factors other than 2 and 5.