What is 15/38 plus 9/13? (Answer: 537/494)

Exact Answer

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Problem: What is 15/38 plus 9/13?
Formula / Expression: 15/38 + 9/13
Final Answer: 1 43/494 (537/494)
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Step-by-Step Solution:

Step 1: Find the Least Common Denominator (LCD)
The denominators 38 and 13 are coprime (they share no common factors other than 1). Therefore, their Least Common Denominator (LCD) is simply their direct product: 38 × 13 = 494.
Working: LCD(38, 13) = 494

Step 2: Convert to Equivalent Fractions with Common Denominator 494
Multiply the numerator and denominator of 15/38 by 13, and multiply the numerator and denominator of 9/13 by 38 so both fractions share the common base 494.
Working: 15 × 13/38 × 13 = 195/494 and 9 × 38/13 × 38 = 342/494

Step 3: Add the Numerators
Now add the numerators (195 + 342 = 537) and keep the common denominator 494 unchanged.
Working: 195 + 342/494 = 537/494

Step 4: Check if the Fraction Can Be Simplified
The Greatest Common Divisor (GCD) of 537 and 494 is 1, confirming that 537/494 cannot be reduced further—it is already in its simplest irreducible form.
Working: 537/494

Step 5: Convert Improper Fraction to a Mixed Number
Since the numerator (537) is greater than the denominator (494), divide 537 by 494: it goes in 1 whole time(s) with a remainder of 43, giving the mixed number 1 43/494.
Working: 537/494 = 1 43/494

Step 6: Decimal & Percentage Representation
Dividing the numerator 537 by denominator 494 produces a repeating decimal (approximately 1.087045, or 108.7045%).
Working: 537 ÷ 494 = 1.087045 (108.7045%)

Key Values:
- Simplified Fraction: 537/494
- Mixed Number Form: 1 43/494
- Decimal Value: 1.087045
- Percentage: 108.7045%

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Solved with FractionsCalc:
https://fractionscalc.com/what-is-15-38-plus-9-13/
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15/38 + 9/13 = 537/494

Simplified Fraction

537/494

Mixed Number

1 43/494

Decimal Value

1.087045

Percentage

108.7045%

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Step-by-Step Solution: 15/38 + 9/13

Step 1

Find the Least Common Denominator (LCD)

The denominators 38 and 13 are coprime (they share no common factors other than 1). Therefore, their Least Common Denominator (LCD) is simply their direct product: 38 × 13 = 494.

LCD(38, 13) = 494

Step 2

Convert to Equivalent Fractions with Common Denominator 494

Multiply the numerator and denominator of 15/38 by 13, and multiply the numerator and denominator of 9/13 by 38 so both fractions share the common base 494.

15 × 13/38 × 13 = 195/494 and 9 × 38/13 × 38 = 342/494

Step 3

Add the Numerators

Now add the numerators (195 + 342 = 537) and keep the common denominator 494 unchanged.

195 + 342/494 = 537/494

Step 4

Check if the Fraction Can Be Simplified

The Greatest Common Divisor (GCD) of 537 and 494 is 1, confirming that 537/494 cannot be reduced further—it is already in its simplest irreducible form.

537/494

Step 5

Convert Improper Fraction to a Mixed Number

Since the numerator (537) is greater than the denominator (494), divide 537 by 494: it goes in 1 whole time(s) with a remainder of 43, giving the mixed number 1 43/494.

537/494 = 143/494

Step 6

Decimal & Percentage Representation

Dividing the numerator 537 by denominator 494 produces a repeating decimal (approximately 1.087045, or 108.7045%).

537 ÷ 494 = 1.087045 (108.7045%)

Visual Representation

The diagram below illustrates 15/38 plus 9/13 visually:

Summary & Alternative Representations

Property / Format	Value
Lowest Terms Fraction	`537/494`
Mixed Number Form	`1 43/494`
Decimal Form	`1.087045`
Percentage	`108.7045%`

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Frequently Asked Questions

What is 15/38 plus 9/13 as a fraction?

15/38 + 9/13 in simplest fraction form is 537/494 (or 1 43/494 as a mixed number).

What is 15/38 plus 9/13 as a decimal?

15/38 + 9/13 converted to a decimal is 1.087045.

What is 15/38 plus 9/13 as a percentage?

15/38 + 9/13 expressed as a percentage is 108.7045%.

How do you write 15/38 plus 9/13 as a mixed number?

Because the numerator is greater than the denominator, the improper fraction 537/494 can be written as the mixed number 1 43/494.

Does 15/38 plus 9/13 result in a terminating or repeating decimal?

It results in a repeating decimal (approximately 1.087045...) because the denominator contains prime factors other than 2 and 5.