What is 12/26 plus 10/21? (Answer: 256/273)

Exact Answer

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Problem: What is 12/26 plus 10/21?
Formula / Expression: 12/26 + 10/21
Final Answer: 256/273
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Step-by-Step Solution:

Step 1: Find the Least Common Denominator (LCD)
The denominators 26 and 21 are coprime (they share no common factors other than 1). Therefore, their Least Common Denominator (LCD) is simply their direct product: 26 × 21 = 546.
Working: LCD(26, 21) = 546

Step 2: Convert to Equivalent Fractions with Common Denominator 546
Multiply the numerator and denominator of 12/26 by 21, and multiply the numerator and denominator of 10/21 by 26 so both fractions share the common base 546.
Working: 12 × 21/26 × 21 = 252/546 and 10 × 26/21 × 26 = 260/546

Step 3: Add the Numerators
Now add the numerators (252 + 260 = 512) and keep the common denominator 546 unchanged.
Working: 252 + 260/546 = 512/546

Step 4: Simplify the Fraction to Lowest Terms
Find the Greatest Common Divisor (GCD) of 512 and 546, which is 2. Divide both the numerator and denominator by 2.
Working: 512 ÷ 2/546 ÷ 2 = 256/273

Step 5: Decimal & Percentage Representation
Dividing the numerator 256 by denominator 273 produces a repeating decimal (approximately 0.937729, or 93.7729%).
Working: 256 ÷ 273 = 0.937729 (93.7729%)

Key Values:
- Simplified Fraction: 256/273
- Mixed Number Form: 256/273
- Decimal Value: 0.937729
- Percentage: 93.7729%

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Solved with FractionsCalc:
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12/26 + 10/21 = 256/273

Simplified Fraction

256/273

Mixed Number

Proper (256/273)

Decimal Value

0.937729

Percentage

93.7729%

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Step-by-Step Solution: 12/26 + 10/21

Step 1

Find the Least Common Denominator (LCD)

The denominators 26 and 21 are coprime (they share no common factors other than 1). Therefore, their Least Common Denominator (LCD) is simply their direct product: 26 × 21 = 546.

LCD(26, 21) = 546

Step 2

Convert to Equivalent Fractions with Common Denominator 546

Multiply the numerator and denominator of 12/26 by 21, and multiply the numerator and denominator of 10/21 by 26 so both fractions share the common base 546.

12 × 21/26 × 21 = 252/546 and 10 × 26/21 × 26 = 260/546

Step 3

Add the Numerators

Now add the numerators (252 + 260 = 512) and keep the common denominator 546 unchanged.

252 + 260/546 = 512/546

Step 4

Simplify the Fraction to Lowest Terms

Find the Greatest Common Divisor (GCD) of 512 and 546, which is 2. Divide both the numerator and denominator by 2.

512 ÷ 2/546 ÷ 2 = 256/273

Step 5

Decimal & Percentage Representation

Dividing the numerator 256 by denominator 273 produces a repeating decimal (approximately 0.937729, or 93.7729%).

256 ÷ 273 = 0.937729 (93.7729%)

Visual Representation

The diagram below illustrates 12/26 plus 10/21 visually:

Summary & Alternative Representations

Property / Format	Value
Lowest Terms Fraction	`256/273`
Mixed Number Form	`256/273`
Decimal Form	`0.937729`
Percentage	`93.7729%`

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Frequently Asked Questions

What is 12/26 plus 10/21 as a fraction?

12/26 + 10/21 in simplest fraction form is 256/273.

What is 12/26 plus 10/21 as a decimal?

12/26 + 10/21 converted to a decimal is 0.937729.

What is 12/26 plus 10/21 as a percentage?

12/26 + 10/21 expressed as a percentage is 93.7729%.

Does 12/26 plus 10/21 result in a terminating or repeating decimal?

It results in a repeating decimal (approximately 0.937729...) because the denominator contains prime factors other than 2 and 5.