What is 2/7 plus 9/15? (Answer: 31/35)

Exact Answer

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Problem: What is 2/7 plus 9/15?
Formula / Expression: 2/7 + 9/15
Final Answer: 31/35
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Step-by-Step Solution:

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

Step 2: Convert to Equivalent Fractions with Common Denominator 105
Multiply the numerator and denominator of 2/7 by 15, and multiply the numerator and denominator of 9/15 by 7 so both fractions share the common base 105.
Working: 2 × 15/7 × 15 = 30/105 and 9 × 7/15 × 7 = 63/105

Step 3: Add the Numerators
Now add the numerators (30 + 63 = 93) and keep the common denominator 105 unchanged.
Working: 30 + 63/105 = 93/105

Step 4: Simplify the Fraction to Lowest Terms
Find the Greatest Common Divisor (GCD) of 93 and 105, which is 3. Divide both the numerator and denominator by 3.
Working: 93 ÷ 3/105 ÷ 3 = 31/35

Step 5: Decimal & Percentage Representation
Dividing the numerator 31 by denominator 35 produces a repeating decimal (approximately 0.885714, or 88.5714%).
Working: 31 ÷ 35 = 0.885714 (88.5714%)

Key Values:
- Simplified Fraction: 31/35
- Mixed Number Form: 31/35
- Decimal Value: 0.885714
- Percentage: 88.5714%

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Solved with FractionsCalc:
https://fractionscalc.com/what-is-2-7-plus-9-15/
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2/7 + 9/15 = 31/35

Simplified Fraction

31/35

Mixed Number

Proper (31/35)

Decimal Value

0.885714

Percentage

88.5714%

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Step-by-Step Solution: 2/7 + 9/15

Step 1

Find the Least Common Denominator (LCD)

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

LCD(7, 15) = 105

Step 2

Convert to Equivalent Fractions with Common Denominator 105

Multiply the numerator and denominator of 2/7 by 15, and multiply the numerator and denominator of 9/15 by 7 so both fractions share the common base 105.

2 × 15/7 × 15 = 30/105 and 9 × 7/15 × 7 = 63/105

Step 3

Add the Numerators

Now add the numerators (30 + 63 = 93) and keep the common denominator 105 unchanged.

30 + 63/105 = 93/105

Step 4

Simplify the Fraction to Lowest Terms

Find the Greatest Common Divisor (GCD) of 93 and 105, which is 3. Divide both the numerator and denominator by 3.

93 ÷ 3/105 ÷ 3 = 31/35

Step 5

Decimal & Percentage Representation

Dividing the numerator 31 by denominator 35 produces a repeating decimal (approximately 0.885714, or 88.5714%).

31 ÷ 35 = 0.885714 (88.5714%)

Visual Representation

The diagram below illustrates 2/7 plus 9/15 visually:

Summary & Alternative Representations

Property / Format	Value
Lowest Terms Fraction	`31/35`
Mixed Number Form	`31/35`
Decimal Form	`0.885714`
Percentage	`88.5714%`

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Frequently Asked Questions

What is 2/7 plus 9/15 as a fraction?

2/7 + 9/15 in simplest fraction form is 31/35.

What is 2/7 plus 9/15 as a decimal?

2/7 + 9/15 converted to a decimal is 0.885714.

What is 2/7 plus 9/15 as a percentage?

2/7 + 9/15 expressed as a percentage is 88.5714%.

Does 2/7 plus 9/15 result in a terminating or repeating decimal?

It results in a repeating decimal (approximately 0.885714...) because the denominator contains prime factors other than 2 and 5.