What is 5/15 plus 7/13? (Answer: 34/39)

Exact Answer

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Problem: What is 5/15 plus 7/13?
Formula / Expression: 5/15 + 7/13
Final Answer: 34/39
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Step-by-Step Solution:

Step 1: Find the Least Common Denominator (LCD)
The denominators 15 and 13 are coprime (they share no common factors other than 1). Therefore, their Least Common Denominator (LCD) is simply their direct product: 15 × 13 = 195.
Working: LCD(15, 13) = 195

Step 2: Convert to Equivalent Fractions with Common Denominator 195
Multiply the numerator and denominator of 5/15 by 13, and multiply the numerator and denominator of 7/13 by 15 so both fractions share the common base 195.
Working: 5 × 13/15 × 13 = 65/195 and 7 × 15/13 × 15 = 105/195

Step 3: Add the Numerators
Now add the numerators (65 + 105 = 170) and keep the common denominator 195 unchanged.
Working: 65 + 105/195 = 170/195

Step 4: Simplify the Fraction to Lowest Terms
Find the Greatest Common Divisor (GCD) of 170 and 195, which is 5. Divide both the numerator and denominator by 5.
Working: 170 ÷ 5/195 ÷ 5 = 34/39

Step 5: Decimal & Percentage Representation
Dividing the numerator 34 by denominator 39 produces a repeating decimal (approximately 0.871795, or 87.1795%).
Working: 34 ÷ 39 = 0.871795 (87.1795%)

Key Values:
- Simplified Fraction: 34/39
- Mixed Number Form: 34/39
- Decimal Value: 0.871795
- Percentage: 87.1795%

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Solved with FractionsCalc:
https://fractionscalc.com/what-is-5-15-plus-7-13/
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5/15 + 7/13 = 34/39

Simplified Fraction

34/39

Mixed Number

Proper (34/39)

Decimal Value

0.871795

Percentage

87.1795%

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Step-by-Step Solution: 5/15 + 7/13

Step 1

Find the Least Common Denominator (LCD)

The denominators 15 and 13 are coprime (they share no common factors other than 1). Therefore, their Least Common Denominator (LCD) is simply their direct product: 15 × 13 = 195.

LCD(15, 13) = 195

Step 2

Convert to Equivalent Fractions with Common Denominator 195

Multiply the numerator and denominator of 5/15 by 13, and multiply the numerator and denominator of 7/13 by 15 so both fractions share the common base 195.

5 × 13/15 × 13 = 65/195 and 7 × 15/13 × 15 = 105/195

Step 3

Add the Numerators

Now add the numerators (65 + 105 = 170) and keep the common denominator 195 unchanged.

65 + 105/195 = 170/195

Step 4

Simplify the Fraction to Lowest Terms

Find the Greatest Common Divisor (GCD) of 170 and 195, which is 5. Divide both the numerator and denominator by 5.

170 ÷ 5/195 ÷ 5 = 34/39

Step 5

Decimal & Percentage Representation

Dividing the numerator 34 by denominator 39 produces a repeating decimal (approximately 0.871795, or 87.1795%).

34 ÷ 39 = 0.871795 (87.1795%)

Visual Representation

The diagram below illustrates 5/15 plus 7/13 visually:

Summary & Alternative Representations

Property / Format	Value
Lowest Terms Fraction	`34/39`
Mixed Number Form	`34/39`
Decimal Form	`0.871795`
Percentage	`87.1795%`

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Frequently Asked Questions

What is 5/15 plus 7/13 as a fraction?

5/15 + 7/13 in simplest fraction form is 34/39.

What is 5/15 plus 7/13 as a decimal?

5/15 + 7/13 converted to a decimal is 0.871795.

What is 5/15 plus 7/13 as a percentage?

5/15 + 7/13 expressed as a percentage is 87.1795%.

Does 5/15 plus 7/13 result in a terminating or repeating decimal?

It results in a repeating decimal (approximately 0.871795...) because the denominator contains prime factors other than 2 and 5.