What is 2/15 plus 5/7? (Answer: 89/105)

Exact Answer

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Problem: What is 2/15 plus 5/7?
Formula / Expression: 2/15 + 5/7
Final Answer: 89/105
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Step-by-Step Solution:

Step 1: Find the Least Common Denominator (LCD)
The denominators 15 and 7 are coprime (they share no common factors other than 1). Therefore, their Least Common Denominator (LCD) is simply their direct product: 15 × 7 = 105.
Working: LCD(15, 7) = 105

Step 2: Convert to Equivalent Fractions with Common Denominator 105
Multiply the numerator and denominator of 2/15 by 7, and multiply the numerator and denominator of 5/7 by 15 so both fractions share the common base 105.
Working: 2 × 7/15 × 7 = 14/105 and 5 × 15/7 × 15 = 75/105

Step 3: Add the Numerators
Now add the numerators (14 + 75 = 89) and keep the common denominator 105 unchanged.
Working: 14 + 75/105 = 89/105

Step 4: Check if the Fraction Can Be Simplified
The Greatest Common Divisor (GCD) of 89 and 105 is 1, confirming that 89/105 cannot be reduced further—it is already in its simplest irreducible form.
Working: 89/105

Step 5: Decimal & Percentage Representation
Dividing the numerator 89 by denominator 105 produces a repeating decimal (approximately 0.847619, or 84.7619%).
Working: 89 ÷ 105 = 0.847619 (84.7619%)

Key Values:
- Simplified Fraction: 89/105
- Mixed Number Form: 89/105
- Decimal Value: 0.847619
- Percentage: 84.7619%

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Solved with FractionsCalc:
https://fractionscalc.com/what-is-2-15-plus-5-7/
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2/15 + 5/7 = 89/105

Simplified Fraction

89/105

Mixed Number

Proper (89/105)

Decimal Value

0.847619

Percentage

84.7619%

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Step-by-Step Solution: 2/15 + 5/7

Step 1

Find the Least Common Denominator (LCD)

The denominators 15 and 7 are coprime (they share no common factors other than 1). Therefore, their Least Common Denominator (LCD) is simply their direct product: 15 × 7 = 105.

LCD(15, 7) = 105

Step 2

Convert to Equivalent Fractions with Common Denominator 105

Multiply the numerator and denominator of 2/15 by 7, and multiply the numerator and denominator of 5/7 by 15 so both fractions share the common base 105.

2 × 7/15 × 7 = 14/105 and 5 × 15/7 × 15 = 75/105

Step 3

Add the Numerators

Now add the numerators (14 + 75 = 89) and keep the common denominator 105 unchanged.

14 + 75/105 = 89/105

Step 4

Check if the Fraction Can Be Simplified

The Greatest Common Divisor (GCD) of 89 and 105 is 1, confirming that 89/105 cannot be reduced further—it is already in its simplest irreducible form.

89/105

Step 5

Decimal & Percentage Representation

Dividing the numerator 89 by denominator 105 produces a repeating decimal (approximately 0.847619, or 84.7619%).

89 ÷ 105 = 0.847619 (84.7619%)

Visual Representation

The diagram below illustrates 2/15 plus 5/7 visually:

Summary & Alternative Representations

Property / Format	Value
Lowest Terms Fraction	`89/105`
Mixed Number Form	`89/105`
Decimal Form	`0.847619`
Percentage	`84.7619%`

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Frequently Asked Questions

What is 2/15 plus 5/7 as a fraction?

2/15 + 5/7 in simplest fraction form is 89/105.

What is 2/15 plus 5/7 as a decimal?

2/15 + 5/7 converted to a decimal is 0.847619.

What is 2/15 plus 5/7 as a percentage?

2/15 + 5/7 expressed as a percentage is 84.7619%.

Does 2/15 plus 5/7 result in a terminating or repeating decimal?

It results in a repeating decimal (approximately 0.847619...) because the denominator contains prime factors other than 2 and 5.