What is 5/20 plus 2/7? (Answer: 15/28)

Exact Answer

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Problem: What is 5/20 plus 2/7?
Formula / Expression: 5/20 + 2/7
Final Answer: 15/28
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Step-by-Step Solution:

Step 1: Find the Least Common Denominator (LCD)
The denominators 20 and 7 are coprime (they share no common factors other than 1). Therefore, their Least Common Denominator (LCD) is simply their direct product: 20 × 7 = 140.
Working: LCD(20, 7) = 140

Step 2: Convert to Equivalent Fractions with Common Denominator 140
Multiply the numerator and denominator of 5/20 by 7, and multiply the numerator and denominator of 2/7 by 20 so both fractions share the common base 140.
Working: 5 × 7/20 × 7 = 35/140 and 2 × 20/7 × 20 = 40/140

Step 3: Add the Numerators
Now add the numerators (35 + 40 = 75) and keep the common denominator 140 unchanged.
Working: 35 + 40/140 = 75/140

Step 4: Simplify the Fraction to Lowest Terms
Find the Greatest Common Divisor (GCD) of 75 and 140, which is 5. Divide both the numerator and denominator by 5.
Working: 75 ÷ 5/140 ÷ 5 = 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-5-20-plus-2-7/
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5/20 + 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: 5/20 + 2/7

Step 1

Find the Least Common Denominator (LCD)

The denominators 20 and 7 are coprime (they share no common factors other than 1). Therefore, their Least Common Denominator (LCD) is simply their direct product: 20 × 7 = 140.

LCD(20, 7) = 140

Step 2

Convert to Equivalent Fractions with Common Denominator 140

Multiply the numerator and denominator of 5/20 by 7, and multiply the numerator and denominator of 2/7 by 20 so both fractions share the common base 140.

5 × 7/20 × 7 = 35/140 and 2 × 20/7 × 20 = 40/140

Step 3

Add the Numerators

Now add the numerators (35 + 40 = 75) and keep the common denominator 140 unchanged.

35 + 40/140 = 75/140

Step 4

Simplify the Fraction to Lowest Terms

Find the Greatest Common Divisor (GCD) of 75 and 140, which is 5. Divide both the numerator and denominator by 5.

75 ÷ 5/140 ÷ 5 = 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 5/20 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 5/20 plus 2/7 as a fraction?

5/20 + 2/7 in simplest fraction form is 15/28.

What is 5/20 plus 2/7 as a decimal?

5/20 + 2/7 converted to a decimal is 0.535714.

What is 5/20 plus 2/7 as a percentage?

5/20 + 2/7 expressed as a percentage is 53.5714%.

Does 5/20 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.