What is 7/57 plus 9/13? (Answer: 604/741)

Exact Answer

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Problem: What is 7/57 plus 9/13?
Formula / Expression: 7/57 + 9/13
Final Answer: 604/741
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Step-by-Step Solution:

Step 1: Find the Least Common Denominator (LCD)
The denominators 57 and 13 are coprime (they share no common factors other than 1). Therefore, their Least Common Denominator (LCD) is simply their direct product: 57 × 13 = 741.
Working: LCD(57, 13) = 741

Step 2: Convert to Equivalent Fractions with Common Denominator 741
Multiply the numerator and denominator of 7/57 by 13, and multiply the numerator and denominator of 9/13 by 57 so both fractions share the common base 741.
Working: 7 × 13/57 × 13 = 91/741 and 9 × 57/13 × 57 = 513/741

Step 3: Add the Numerators
Now add the numerators (91 + 513 = 604) and keep the common denominator 741 unchanged.
Working: 91 + 513/741 = 604/741

Step 4: Check if the Fraction Can Be Simplified
The Greatest Common Divisor (GCD) of 604 and 741 is 1, confirming that 604/741 cannot be reduced further—it is already in its simplest irreducible form.
Working: 604/741

Step 5: Decimal & Percentage Representation
Dividing the numerator 604 by denominator 741 produces a repeating decimal (approximately 0.815115, or 81.5115%).
Working: 604 ÷ 741 = 0.815115 (81.5115%)

Key Values:
- Simplified Fraction: 604/741
- Mixed Number Form: 604/741
- Decimal Value: 0.815115
- Percentage: 81.5115%

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Solved with FractionsCalc:
https://fractionscalc.com/what-is-7-57-plus-9-13/
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7/57 + 9/13 = 604/741

Simplified Fraction

604/741

Mixed Number

Proper (604/741)

Decimal Value

0.815115

Percentage

81.5115%

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Step-by-Step Solution: 7/57 + 9/13

Step 1

Find the Least Common Denominator (LCD)

The denominators 57 and 13 are coprime (they share no common factors other than 1). Therefore, their Least Common Denominator (LCD) is simply their direct product: 57 × 13 = 741.

LCD(57, 13) = 741

Step 2

Convert to Equivalent Fractions with Common Denominator 741

Multiply the numerator and denominator of 7/57 by 13, and multiply the numerator and denominator of 9/13 by 57 so both fractions share the common base 741.

7 × 13/57 × 13 = 91/741 and 9 × 57/13 × 57 = 513/741

Step 3

Add the Numerators

Now add the numerators (91 + 513 = 604) and keep the common denominator 741 unchanged.

91 + 513/741 = 604/741

Step 4

Check if the Fraction Can Be Simplified

The Greatest Common Divisor (GCD) of 604 and 741 is 1, confirming that 604/741 cannot be reduced further—it is already in its simplest irreducible form.

604/741

Step 5

Decimal & Percentage Representation

Dividing the numerator 604 by denominator 741 produces a repeating decimal (approximately 0.815115, or 81.5115%).

604 ÷ 741 = 0.815115 (81.5115%)

Visual Representation

The diagram below illustrates 7/57 plus 9/13 visually:

Summary & Alternative Representations

Property / Format	Value
Lowest Terms Fraction	`604/741`
Mixed Number Form	`604/741`
Decimal Form	`0.815115`
Percentage	`81.5115%`

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Frequently Asked Questions

What is 7/57 plus 9/13 as a fraction?

7/57 + 9/13 in simplest fraction form is 604/741.

What is 7/57 plus 9/13 as a decimal?

7/57 + 9/13 converted to a decimal is 0.815115.

What is 7/57 plus 9/13 as a percentage?

7/57 + 9/13 expressed as a percentage is 81.5115%.

Does 7/57 plus 9/13 result in a terminating or repeating decimal?

It results in a repeating decimal (approximately 0.815115...) because the denominator contains prime factors other than 2 and 5.