What is 7/28 plus 2/7? (Answer: 15/28)

Exact Answer

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Problem: What is 7/28 plus 2/7?
Formula / Expression: 7/28 + 2/7
Final Answer: 15/28
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Step-by-Step Solution:

Step 1: Find the Least Common Denominator (LCD)
Notice that 28 is an exact multiple of 7 (7 × 4 = 28). The Least Common Denominator (LCD) is simply 28, meaning we only need to scale one fraction.
Working: LCD(28, 7) = 28

Step 2: Convert to Equivalent Fractions with Common Denominator 28
Multiply the numerator and denominator of 7/28 by 1, and multiply the numerator and denominator of 2/7 by 4 so both fractions share the common base 28.
Working: 7 × 1/28 × 1 = 7/28 and 2 × 4/7 × 4 = 8/28

Step 3: Add the Numerators
Now add the numerators (7 + 8 = 15) and keep the common denominator 28 unchanged.
Working: 7 + 8/28 = 15/28

Step 4: Check if the Fraction Can Be Simplified
The Greatest Common Divisor (GCD) of 15 and 28 is 1, confirming that 15/28 cannot be reduced further—it is already in its simplest irreducible form.
Working: 15/28

Step 5: Decimal & Percentage Representation
Dividing the numerator 15 by denominator 28 produces a repeating decimal (approximately 0.535714, or 53.5714%).
Working: 15 ÷ 28 = 0.535714 (53.5714%)

Key Values:
- Simplified Fraction: 15/28
- Mixed Number Form: 15/28
- Decimal Value: 0.535714
- Percentage: 53.5714%

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Solved with FractionsCalc:
https://fractionscalc.com/what-is-7-28-plus-2-7/
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7/28 + 2/7 = 15/28

Simplified Fraction

15/28

Mixed Number

Proper (15/28)

Decimal Value

0.535714

Percentage

53.5714%

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Step-by-Step Solution: 7/28 + 2/7

Step 1

Find the Least Common Denominator (LCD)

Notice that 28 is an exact multiple of 7 (7 × 4 = 28). The Least Common Denominator (LCD) is simply 28, meaning we only need to scale one fraction.

LCD(28, 7) = 28

Step 2

Convert to Equivalent Fractions with Common Denominator 28

Multiply the numerator and denominator of 7/28 by 1, and multiply the numerator and denominator of 2/7 by 4 so both fractions share the common base 28.

7 × 1/28 × 1 = 7/28 and 2 × 4/7 × 4 = 8/28

Step 3

Add the Numerators

Now add the numerators (7 + 8 = 15) and keep the common denominator 28 unchanged.

7 + 8/28 = 15/28

Step 4

Check if the Fraction Can Be Simplified

The Greatest Common Divisor (GCD) of 15 and 28 is 1, confirming that 15/28 cannot be reduced further—it is already in its simplest irreducible form.

15/28

Step 5

Decimal & Percentage Representation

Dividing the numerator 15 by denominator 28 produces a repeating decimal (approximately 0.535714, or 53.5714%).

15 ÷ 28 = 0.535714 (53.5714%)

Visual Representation

The diagram below illustrates 7/28 plus 2/7 visually:

Summary & Alternative Representations

Property / Format	Value
Lowest Terms Fraction	`15/28`
Mixed Number Form	`15/28`
Decimal Form	`0.535714`
Percentage	`53.5714%`

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Frequently Asked Questions

What is 7/28 plus 2/7 as a fraction?

7/28 + 2/7 in simplest fraction form is 15/28.

What is 7/28 plus 2/7 as a decimal?

7/28 + 2/7 converted to a decimal is 0.535714.

What is 7/28 plus 2/7 as a percentage?

7/28 + 2/7 expressed as a percentage is 53.5714%.

Does 7/28 plus 2/7 result in a terminating or repeating decimal?

It results in a repeating decimal (approximately 0.535714...) because the denominator contains prime factors other than 2 and 5.