What is 20/36 plus 9/13? (Answer: 146/117)

Exact Answer

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Problem: What is 20/36 plus 9/13?
Formula / Expression: 20/36 + 9/13
Final Answer: 1 29/117 (146/117)
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Step-by-Step Solution:

Step 1: Find the Least Common Denominator (LCD)
The denominators 36 and 13 are coprime (they share no common factors other than 1). Therefore, their Least Common Denominator (LCD) is simply their direct product: 36 × 13 = 468.
Working: LCD(36, 13) = 468

Step 2: Convert to Equivalent Fractions with Common Denominator 468
Multiply the numerator and denominator of 20/36 by 13, and multiply the numerator and denominator of 9/13 by 36 so both fractions share the common base 468.
Working: 20 × 13/36 × 13 = 260/468 and 9 × 36/13 × 36 = 324/468

Step 3: Add the Numerators
Now add the numerators (260 + 324 = 584) and keep the common denominator 468 unchanged.
Working: 260 + 324/468 = 584/468

Step 4: Simplify the Fraction to Lowest Terms
Find the Greatest Common Divisor (GCD) of 584 and 468, which is 4. Divide both the numerator and denominator by 4.
Working: 584 ÷ 4/468 ÷ 4 = 146/117

Step 5: Convert Improper Fraction to a Mixed Number
Since the numerator (146) is greater than the denominator (117), divide 146 by 117: it goes in 1 whole time(s) with a remainder of 29, giving the mixed number 1 29/117.
Working: 146/117 = 1 29/117

Step 6: Decimal & Percentage Representation
Dividing the numerator 146 by denominator 117 produces a repeating decimal (approximately 1.247863, or 124.7863%).
Working: 146 ÷ 117 = 1.247863 (124.7863%)

Key Values:
- Simplified Fraction: 146/117
- Mixed Number Form: 1 29/117
- Decimal Value: 1.247863
- Percentage: 124.7863%

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20/36 + 9/13 = 146/117

Simplified Fraction

146/117

Mixed Number

1 29/117

Decimal Value

1.247863

Percentage

124.7863%

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Step-by-Step Solution: 20/36 + 9/13

Step 1

Find the Least Common Denominator (LCD)

The denominators 36 and 13 are coprime (they share no common factors other than 1). Therefore, their Least Common Denominator (LCD) is simply their direct product: 36 × 13 = 468.

LCD(36, 13) = 468

Step 2

Convert to Equivalent Fractions with Common Denominator 468

Multiply the numerator and denominator of 20/36 by 13, and multiply the numerator and denominator of 9/13 by 36 so both fractions share the common base 468.

20 × 13/36 × 13 = 260/468 and 9 × 36/13 × 36 = 324/468

Step 3

Add the Numerators

Now add the numerators (260 + 324 = 584) and keep the common denominator 468 unchanged.

260 + 324/468 = 584/468

Step 4

Simplify the Fraction to Lowest Terms

Find the Greatest Common Divisor (GCD) of 584 and 468, which is 4. Divide both the numerator and denominator by 4.

584 ÷ 4/468 ÷ 4 = 146/117

Step 5

Convert Improper Fraction to a Mixed Number

Since the numerator (146) is greater than the denominator (117), divide 146 by 117: it goes in 1 whole time(s) with a remainder of 29, giving the mixed number 1 29/117.

146/117 = 129/117

Step 6

Decimal & Percentage Representation

Dividing the numerator 146 by denominator 117 produces a repeating decimal (approximately 1.247863, or 124.7863%).

146 ÷ 117 = 1.247863 (124.7863%)

Visual Representation

The diagram below illustrates 20/36 plus 9/13 visually:

Summary & Alternative Representations

Property / Format	Value
Lowest Terms Fraction	`146/117`
Mixed Number Form	`1 29/117`
Decimal Form	`1.247863`
Percentage	`124.7863%`

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Frequently Asked Questions

What is 20/36 plus 9/13 as a fraction?

20/36 + 9/13 in simplest fraction form is 146/117 (or 1 29/117 as a mixed number).

What is 20/36 plus 9/13 as a decimal?

20/36 + 9/13 converted to a decimal is 1.247863.

What is 20/36 plus 9/13 as a percentage?

20/36 + 9/13 expressed as a percentage is 124.7863%.

How do you write 20/36 plus 9/13 as a mixed number?

Because the numerator is greater than the denominator, the improper fraction 146/117 can be written as the mixed number 1 29/117.

Does 20/36 plus 9/13 result in a terminating or repeating decimal?

It results in a repeating decimal (approximately 1.247863...) because the denominator contains prime factors other than 2 and 5.