What is 3/5 plus 10/13? (Answer: 89/65)

Exact Answer

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Problem: What is 3/5 plus 10/13?
Formula / Expression: 3/5 + 10/13
Final Answer: 1 24/65 (89/65)
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Step-by-Step Solution:

Step 1: Find the Least Common Denominator (LCD)
The denominators 5 and 13 are coprime (they share no common factors other than 1). Therefore, their Least Common Denominator (LCD) is simply their direct product: 5 × 13 = 65.
Working: LCD(5, 13) = 65

Step 2: Convert to Equivalent Fractions with Common Denominator 65
Multiply the numerator and denominator of 3/5 by 13, and multiply the numerator and denominator of 10/13 by 5 so both fractions share the common base 65.
Working: 3 × 13/5 × 13 = 39/65 and 10 × 5/13 × 5 = 50/65

Step 3: Add the Numerators
Now add the numerators (39 + 50 = 89) and keep the common denominator 65 unchanged.
Working: 39 + 50/65 = 89/65

Step 4: Check if the Fraction Can Be Simplified
The Greatest Common Divisor (GCD) of 89 and 65 is 1, confirming that 89/65 cannot be reduced further—it is already in its simplest irreducible form.
Working: 89/65

Step 5: Convert Improper Fraction to a Mixed Number
Since the numerator (89) is greater than the denominator (65), divide 89 by 65: it goes in 1 whole time(s) with a remainder of 24, giving the mixed number 1 24/65.
Working: 89/65 = 1 24/65

Step 6: Decimal & Percentage Representation
Dividing the numerator 89 by denominator 65 produces a repeating decimal (approximately 1.369231, or 136.9231%).
Working: 89 ÷ 65 = 1.369231 (136.9231%)

Key Values:
- Simplified Fraction: 89/65
- Mixed Number Form: 1 24/65
- Decimal Value: 1.369231
- Percentage: 136.9231%

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Solved with FractionsCalc:
https://fractionscalc.com/what-is-3-5-plus-10-13/
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3/5 + 10/13 = 89/65

Simplified Fraction

89/65

Mixed Number

1 24/65

Decimal Value

1.369231

Percentage

136.9231%

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Step-by-Step Solution: 3/5 + 10/13

Step 1

Find the Least Common Denominator (LCD)

The denominators 5 and 13 are coprime (they share no common factors other than 1). Therefore, their Least Common Denominator (LCD) is simply their direct product: 5 × 13 = 65.

LCD(5, 13) = 65

Step 2

Convert to Equivalent Fractions with Common Denominator 65

Multiply the numerator and denominator of 3/5 by 13, and multiply the numerator and denominator of 10/13 by 5 so both fractions share the common base 65.

3 × 13/5 × 13 = 39/65 and 10 × 5/13 × 5 = 50/65

Step 3

Add the Numerators

Now add the numerators (39 + 50 = 89) and keep the common denominator 65 unchanged.

39 + 50/65 = 89/65

Step 4

Check if the Fraction Can Be Simplified

The Greatest Common Divisor (GCD) of 89 and 65 is 1, confirming that 89/65 cannot be reduced further—it is already in its simplest irreducible form.

89/65

Step 5

Convert Improper Fraction to a Mixed Number

Since the numerator (89) is greater than the denominator (65), divide 89 by 65: it goes in 1 whole time(s) with a remainder of 24, giving the mixed number 1 24/65.

89/65 = 124/65

Step 6

Decimal & Percentage Representation

Dividing the numerator 89 by denominator 65 produces a repeating decimal (approximately 1.369231, or 136.9231%).

89 ÷ 65 = 1.369231 (136.9231%)

Visual Representation

The diagram below illustrates 3/5 plus 10/13 visually:

Summary & Alternative Representations

Property / Format	Value
Lowest Terms Fraction	`89/65`
Mixed Number Form	`1 24/65`
Decimal Form	`1.369231`
Percentage	`136.9231%`

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Frequently Asked Questions

What is 3/5 plus 10/13 as a fraction?

3/5 + 10/13 in simplest fraction form is 89/65 (or 1 24/65 as a mixed number).

What is 3/5 plus 10/13 as a decimal?

3/5 + 10/13 converted to a decimal is 1.369231.

What is 3/5 plus 10/13 as a percentage?

3/5 + 10/13 expressed as a percentage is 136.9231%.

How do you write 3/5 plus 10/13 as a mixed number?

Because the numerator is greater than the denominator, the improper fraction 89/65 can be written as the mixed number 1 24/65.

Does 3/5 plus 10/13 result in a terminating or repeating decimal?

It results in a repeating decimal (approximately 1.369231...) because the denominator contains prime factors other than 2 and 5.