What is 1/7 plus 7/9? (Answer: 58/63)

Exact Answer

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Problem: What is 1/7 plus 7/9?
Formula / Expression: 1/7 + 7/9
Final Answer: 58/63
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Step-by-Step Solution:

Step 1: Find the Least Common Denominator (LCD)
The denominators 7 and 9 are coprime (they share no common factors other than 1). Therefore, their Least Common Denominator (LCD) is simply their direct product: 7 × 9 = 63.
Working: LCD(7, 9) = 63

Step 2: Convert to Equivalent Fractions with Common Denominator 63
Multiply the numerator and denominator of 1/7 by 9, and multiply the numerator and denominator of 7/9 by 7 so both fractions share the common base 63.
Working: 1 × 9/7 × 9 = 9/63 and 7 × 7/9 × 7 = 49/63

Step 3: Add the Numerators
Now add the numerators (9 + 49 = 58) and keep the common denominator 63 unchanged.
Working: 9 + 49/63 = 58/63

Step 4: Check if the Fraction Can Be Simplified
The Greatest Common Divisor (GCD) of 58 and 63 is 1, confirming that 58/63 cannot be reduced further—it is already in its simplest irreducible form.
Working: 58/63

Step 5: Decimal & Percentage Representation
Dividing the numerator 58 by denominator 63 produces a repeating decimal (approximately 0.920635, or 92.0635%).
Working: 58 ÷ 63 = 0.920635 (92.0635%)

Key Values:
- Simplified Fraction: 58/63
- Mixed Number Form: 58/63
- Decimal Value: 0.920635
- Percentage: 92.0635%

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Solved with FractionsCalc:
https://fractionscalc.com/what-is-1-7-plus-7-9/
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1/7 + 7/9 = 58/63

Simplified Fraction

58/63

Mixed Number

Proper (58/63)

Decimal Value

0.920635

Percentage

92.0635%

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Step-by-Step Solution: 1/7 + 7/9

Step 1

Find the Least Common Denominator (LCD)

The denominators 7 and 9 are coprime (they share no common factors other than 1). Therefore, their Least Common Denominator (LCD) is simply their direct product: 7 × 9 = 63.

LCD(7, 9) = 63

Step 2

Convert to Equivalent Fractions with Common Denominator 63

Multiply the numerator and denominator of 1/7 by 9, and multiply the numerator and denominator of 7/9 by 7 so both fractions share the common base 63.

1 × 9/7 × 9 = 9/63 and 7 × 7/9 × 7 = 49/63

Step 3

Add the Numerators

Now add the numerators (9 + 49 = 58) and keep the common denominator 63 unchanged.

9 + 49/63 = 58/63

Step 4

Check if the Fraction Can Be Simplified

The Greatest Common Divisor (GCD) of 58 and 63 is 1, confirming that 58/63 cannot be reduced further—it is already in its simplest irreducible form.

58/63

Step 5

Decimal & Percentage Representation

Dividing the numerator 58 by denominator 63 produces a repeating decimal (approximately 0.920635, or 92.0635%).

58 ÷ 63 = 0.920635 (92.0635%)

Visual Representation

The diagram below illustrates 1/7 plus 7/9 visually:

Summary & Alternative Representations

Property / Format	Value
Lowest Terms Fraction	`58/63`
Mixed Number Form	`58/63`
Decimal Form	`0.920635`
Percentage	`92.0635%`

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Frequently Asked Questions

What is 1/7 plus 7/9 as a fraction?

1/7 + 7/9 in simplest fraction form is 58/63.

What is 1/7 plus 7/9 as a decimal?

1/7 + 7/9 converted to a decimal is 0.920635.

What is 1/7 plus 7/9 as a percentage?

1/7 + 7/9 expressed as a percentage is 92.0635%.

Does 1/7 plus 7/9 result in a terminating or repeating decimal?

It results in a repeating decimal (approximately 0.920635...) because the denominator contains prime factors other than 2 and 5.