What is 10/47 plus 9/13? (Answer: 553/611)

Exact Answer

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Problem: What is 10/47 plus 9/13?
Formula / Expression: 10/47 + 9/13
Final Answer: 553/611
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Step-by-Step Solution:

Step 1: Find the Least Common Denominator (LCD)
The denominators 47 and 13 are coprime (they share no common factors other than 1). Therefore, their Least Common Denominator (LCD) is simply their direct product: 47 × 13 = 611.
Working: LCD(47, 13) = 611

Step 2: Convert to Equivalent Fractions with Common Denominator 611
Multiply the numerator and denominator of 10/47 by 13, and multiply the numerator and denominator of 9/13 by 47 so both fractions share the common base 611.
Working: 10 × 13/47 × 13 = 130/611 and 9 × 47/13 × 47 = 423/611

Step 3: Add the Numerators
Now add the numerators (130 + 423 = 553) and keep the common denominator 611 unchanged.
Working: 130 + 423/611 = 553/611

Step 4: Check if the Fraction Can Be Simplified
The Greatest Common Divisor (GCD) of 553 and 611 is 1, confirming that 553/611 cannot be reduced further—it is already in its simplest irreducible form.
Working: 553/611

Step 5: Decimal & Percentage Representation
Dividing the numerator 553 by denominator 611 produces a repeating decimal (approximately 0.905074, or 90.5074%).
Working: 553 ÷ 611 = 0.905074 (90.5074%)

Key Values:
- Simplified Fraction: 553/611
- Mixed Number Form: 553/611
- Decimal Value: 0.905074
- Percentage: 90.5074%

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Solved with FractionsCalc:
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10/47 + 9/13 = 553/611

Simplified Fraction

553/611

Mixed Number

Proper (553/611)

Decimal Value

0.905074

Percentage

90.5074%

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Step-by-Step Solution: 10/47 + 9/13

Step 1

Find the Least Common Denominator (LCD)

The denominators 47 and 13 are coprime (they share no common factors other than 1). Therefore, their Least Common Denominator (LCD) is simply their direct product: 47 × 13 = 611.

LCD(47, 13) = 611

Step 2

Convert to Equivalent Fractions with Common Denominator 611

Multiply the numerator and denominator of 10/47 by 13, and multiply the numerator and denominator of 9/13 by 47 so both fractions share the common base 611.

10 × 13/47 × 13 = 130/611 and 9 × 47/13 × 47 = 423/611

Step 3

Add the Numerators

Now add the numerators (130 + 423 = 553) and keep the common denominator 611 unchanged.

130 + 423/611 = 553/611

Step 4

Check if the Fraction Can Be Simplified

The Greatest Common Divisor (GCD) of 553 and 611 is 1, confirming that 553/611 cannot be reduced further—it is already in its simplest irreducible form.

553/611

Step 5

Decimal & Percentage Representation

Dividing the numerator 553 by denominator 611 produces a repeating decimal (approximately 0.905074, or 90.5074%).

553 ÷ 611 = 0.905074 (90.5074%)

Visual Representation

The diagram below illustrates 10/47 plus 9/13 visually:

Summary & Alternative Representations

Property / Format	Value
Lowest Terms Fraction	`553/611`
Mixed Number Form	`553/611`
Decimal Form	`0.905074`
Percentage	`90.5074%`

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Frequently Asked Questions

What is 10/47 plus 9/13 as a fraction?

10/47 + 9/13 in simplest fraction form is 553/611.

What is 10/47 plus 9/13 as a decimal?

10/47 + 9/13 converted to a decimal is 0.905074.

What is 10/47 plus 9/13 as a percentage?

10/47 + 9/13 expressed as a percentage is 90.5074%.

Does 10/47 plus 9/13 result in a terminating or repeating decimal?

It results in a repeating decimal (approximately 0.905074...) because the denominator contains prime factors other than 2 and 5.