What is 2/27 plus 5/21? (Answer: 59/189)

Exact Answer

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Problem: What is 2/27 plus 5/21?
Formula / Expression: 2/27 + 5/21
Final Answer: 59/189
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Step-by-Step Solution:

Step 1: Find the Least Common Denominator (LCD)
The denominators 27 and 21 share a common factor (GCD = 3). Finding their Least Common Multiple gives an LCD of 189 (which is smaller than their product 27 × 21 = 567, keeping the calculation simpler).
Working: LCD(27, 21) = 189

Step 2: Convert to Equivalent Fractions with Common Denominator 189
Multiply the numerator and denominator of 2/27 by 7, and multiply the numerator and denominator of 5/21 by 9 so both fractions share the common base 189.
Working: 2 × 7/27 × 7 = 14/189 and 5 × 9/21 × 9 = 45/189

Step 3: Add the Numerators
Now add the numerators (14 + 45 = 59) and keep the common denominator 189 unchanged.
Working: 14 + 45/189 = 59/189

Step 4: Check if the Fraction Can Be Simplified
The Greatest Common Divisor (GCD) of 59 and 189 is 1, confirming that 59/189 cannot be reduced further—it is already in its simplest irreducible form.
Working: 59/189

Step 5: Decimal & Percentage Representation
Dividing the numerator 59 by denominator 189 produces a repeating decimal (approximately 0.312169, or 31.2169%).
Working: 59 ÷ 189 = 0.312169 (31.2169%)

Key Values:
- Simplified Fraction: 59/189
- Mixed Number Form: 59/189
- Decimal Value: 0.312169
- Percentage: 31.2169%

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Solved with FractionsCalc:
https://fractionscalc.com/what-is-2-27-plus-5-21/
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2/27 + 5/21 = 59/189

Simplified Fraction

59/189

Mixed Number

Proper (59/189)

Decimal Value

0.312169

Percentage

31.2169%

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Step-by-Step Solution: 2/27 + 5/21

Step 1

Find the Least Common Denominator (LCD)

The denominators 27 and 21 share a common factor (GCD = 3). Finding their Least Common Multiple gives an LCD of 189 (which is smaller than their product 27 × 21 = 567, keeping the calculation simpler).

LCD(27, 21) = 189

Step 2

Convert to Equivalent Fractions with Common Denominator 189

Multiply the numerator and denominator of 2/27 by 7, and multiply the numerator and denominator of 5/21 by 9 so both fractions share the common base 189.

2 × 7/27 × 7 = 14/189 and 5 × 9/21 × 9 = 45/189

Step 3

Add the Numerators

Now add the numerators (14 + 45 = 59) and keep the common denominator 189 unchanged.

14 + 45/189 = 59/189

Step 4

Check if the Fraction Can Be Simplified

The Greatest Common Divisor (GCD) of 59 and 189 is 1, confirming that 59/189 cannot be reduced further—it is already in its simplest irreducible form.

59/189

Step 5

Decimal & Percentage Representation

Dividing the numerator 59 by denominator 189 produces a repeating decimal (approximately 0.312169, or 31.2169%).

59 ÷ 189 = 0.312169 (31.2169%)

Visual Representation

The diagram below illustrates 2/27 plus 5/21 visually:

Summary & Alternative Representations

Property / Format	Value
Lowest Terms Fraction	`59/189`
Mixed Number Form	`59/189`
Decimal Form	`0.312169`
Percentage	`31.2169%`

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Frequently Asked Questions

What is 2/27 plus 5/21 as a fraction?

2/27 + 5/21 in simplest fraction form is 59/189.

What is 2/27 plus 5/21 as a decimal?

2/27 + 5/21 converted to a decimal is 0.312169.

What is 2/27 plus 5/21 as a percentage?

2/27 + 5/21 expressed as a percentage is 31.2169%.

Does 2/27 plus 5/21 result in a terminating or repeating decimal?

It results in a repeating decimal (approximately 0.312169...) because the denominator contains prime factors other than 2 and 5.