What is 15/48 plus 10/21? (Answer: 265/336)

Exact Answer

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Problem: What is 15/48 plus 10/21?
Formula / Expression: 15/48 + 10/21
Final Answer: 265/336
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Step-by-Step Solution:

Step 1: Find the Least Common Denominator (LCD)
The denominators 48 and 21 share a common factor (GCD = 3). Finding their Least Common Multiple gives an LCD of 336 (which is smaller than their product 48 × 21 = 1008, keeping the calculation simpler).
Working: LCD(48, 21) = 336

Step 2: Convert to Equivalent Fractions with Common Denominator 336
Multiply the numerator and denominator of 15/48 by 7, and multiply the numerator and denominator of 10/21 by 16 so both fractions share the common base 336.
Working: 15 × 7/48 × 7 = 105/336 and 10 × 16/21 × 16 = 160/336

Step 3: Add the Numerators
Now add the numerators (105 + 160 = 265) and keep the common denominator 336 unchanged.
Working: 105 + 160/336 = 265/336

Step 4: Check if the Fraction Can Be Simplified
The Greatest Common Divisor (GCD) of 265 and 336 is 1, confirming that 265/336 cannot be reduced further—it is already in its simplest irreducible form.
Working: 265/336

Step 5: Decimal & Percentage Representation
Dividing the numerator 265 by denominator 336 produces a repeating decimal (approximately 0.78869, or 78.869%).
Working: 265 ÷ 336 = 0.78869 (78.869%)

Key Values:
- Simplified Fraction: 265/336
- Mixed Number Form: 265/336
- Decimal Value: 0.78869
- Percentage: 78.869%

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Solved with FractionsCalc:
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15/48 + 10/21 = 265/336

Simplified Fraction

265/336

Mixed Number

Proper (265/336)

Decimal Value

0.78869

Percentage

78.869%

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Step-by-Step Solution: 15/48 + 10/21

Step 1

Find the Least Common Denominator (LCD)

The denominators 48 and 21 share a common factor (GCD = 3). Finding their Least Common Multiple gives an LCD of 336 (which is smaller than their product 48 × 21 = 1008, keeping the calculation simpler).

LCD(48, 21) = 336

Step 2

Convert to Equivalent Fractions with Common Denominator 336

Multiply the numerator and denominator of 15/48 by 7, and multiply the numerator and denominator of 10/21 by 16 so both fractions share the common base 336.

15 × 7/48 × 7 = 105/336 and 10 × 16/21 × 16 = 160/336

Step 3

Add the Numerators

Now add the numerators (105 + 160 = 265) and keep the common denominator 336 unchanged.

105 + 160/336 = 265/336

Step 4

Check if the Fraction Can Be Simplified

The Greatest Common Divisor (GCD) of 265 and 336 is 1, confirming that 265/336 cannot be reduced further—it is already in its simplest irreducible form.

265/336

Step 5

Decimal & Percentage Representation

Dividing the numerator 265 by denominator 336 produces a repeating decimal (approximately 0.78869, or 78.869%).

265 ÷ 336 = 0.78869 (78.869%)

Visual Representation

The diagram below illustrates 15/48 plus 10/21 visually:

Summary & Alternative Representations

Property / Format	Value
Lowest Terms Fraction	`265/336`
Mixed Number Form	`265/336`
Decimal Form	`0.78869`
Percentage	`78.869%`

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Frequently Asked Questions

What is 15/48 plus 10/21 as a fraction?

15/48 + 10/21 in simplest fraction form is 265/336.

What is 15/48 plus 10/21 as a decimal?

15/48 + 10/21 converted to a decimal is 0.78869.

What is 15/48 plus 10/21 as a percentage?

15/48 + 10/21 expressed as a percentage is 78.869%.

Does 15/48 plus 10/21 result in a terminating or repeating decimal?

It results in a repeating decimal (approximately 0.78869...) because the denominator contains prime factors other than 2 and 5.