What is 15/44 plus 8/21? (Answer: 667/924)

Exact Answer

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Problem: What is 15/44 plus 8/21?
Formula / Expression: 15/44 + 8/21
Final Answer: 667/924
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Step-by-Step Solution:

Step 1: Find the Least Common Denominator (LCD)
The denominators 44 and 21 are coprime (they share no common factors other than 1). Therefore, their Least Common Denominator (LCD) is simply their direct product: 44 × 21 = 924.
Working: LCD(44, 21) = 924

Step 2: Convert to Equivalent Fractions with Common Denominator 924
Multiply the numerator and denominator of 15/44 by 21, and multiply the numerator and denominator of 8/21 by 44 so both fractions share the common base 924.
Working: 15 × 21/44 × 21 = 315/924 and 8 × 44/21 × 44 = 352/924

Step 3: Add the Numerators
Now add the numerators (315 + 352 = 667) and keep the common denominator 924 unchanged.
Working: 315 + 352/924 = 667/924

Step 4: Check if the Fraction Can Be Simplified
The Greatest Common Divisor (GCD) of 667 and 924 is 1, confirming that 667/924 cannot be reduced further—it is already in its simplest irreducible form.
Working: 667/924

Step 5: Decimal & Percentage Representation
Dividing the numerator 667 by denominator 924 produces a repeating decimal (approximately 0.721861, or 72.1861%).
Working: 667 ÷ 924 = 0.721861 (72.1861%)

Key Values:
- Simplified Fraction: 667/924
- Mixed Number Form: 667/924
- Decimal Value: 0.721861
- Percentage: 72.1861%

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Solved with FractionsCalc:
https://fractionscalc.com/what-is-15-44-plus-8-21/
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15/44 + 8/21 = 667/924

Simplified Fraction

667/924

Mixed Number

Proper (667/924)

Decimal Value

0.721861

Percentage

72.1861%

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Step-by-Step Solution: 15/44 + 8/21

Step 1

Find the Least Common Denominator (LCD)

The denominators 44 and 21 are coprime (they share no common factors other than 1). Therefore, their Least Common Denominator (LCD) is simply their direct product: 44 × 21 = 924.

LCD(44, 21) = 924

Step 2

Convert to Equivalent Fractions with Common Denominator 924

Multiply the numerator and denominator of 15/44 by 21, and multiply the numerator and denominator of 8/21 by 44 so both fractions share the common base 924.

15 × 21/44 × 21 = 315/924 and 8 × 44/21 × 44 = 352/924

Step 3

Add the Numerators

Now add the numerators (315 + 352 = 667) and keep the common denominator 924 unchanged.

315 + 352/924 = 667/924

Step 4

Check if the Fraction Can Be Simplified

The Greatest Common Divisor (GCD) of 667 and 924 is 1, confirming that 667/924 cannot be reduced further—it is already in its simplest irreducible form.

667/924

Step 5

Decimal & Percentage Representation

Dividing the numerator 667 by denominator 924 produces a repeating decimal (approximately 0.721861, or 72.1861%).

667 ÷ 924 = 0.721861 (72.1861%)

Visual Representation

The diagram below illustrates 15/44 plus 8/21 visually:

Summary & Alternative Representations

Property / Format	Value
Lowest Terms Fraction	`667/924`
Mixed Number Form	`667/924`
Decimal Form	`0.721861`
Percentage	`72.1861%`

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Frequently Asked Questions

What is 15/44 plus 8/21 as a fraction?

15/44 + 8/21 in simplest fraction form is 667/924.

What is 15/44 plus 8/21 as a decimal?

15/44 + 8/21 converted to a decimal is 0.721861.

What is 15/44 plus 8/21 as a percentage?

15/44 + 8/21 expressed as a percentage is 72.1861%.

Does 15/44 plus 8/21 result in a terminating or repeating decimal?

It results in a repeating decimal (approximately 0.721861...) because the denominator contains prime factors other than 2 and 5.