What is 1/27 plus 10/21? (Answer: 97/189)

Exact Answer

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Problem: What is 1/27 plus 10/21?
Formula / Expression: 1/27 + 10/21
Final Answer: 97/189
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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 1/27 by 7, and multiply the numerator and denominator of 10/21 by 9 so both fractions share the common base 189.
Working: 1 × 7/27 × 7 = 7/189 and 10 × 9/21 × 9 = 90/189

Step 3: Add the Numerators
Now add the numerators (7 + 90 = 97) and keep the common denominator 189 unchanged.
Working: 7 + 90/189 = 97/189

Step 4: Check if the Fraction Can Be Simplified
The Greatest Common Divisor (GCD) of 97 and 189 is 1, confirming that 97/189 cannot be reduced further—it is already in its simplest irreducible form.
Working: 97/189

Step 5: Decimal & Percentage Representation
Dividing the numerator 97 by denominator 189 produces a repeating decimal (approximately 0.513228, or 51.3228%).
Working: 97 ÷ 189 = 0.513228 (51.3228%)

Key Values:
- Simplified Fraction: 97/189
- Mixed Number Form: 97/189
- Decimal Value: 0.513228
- Percentage: 51.3228%

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Solved with FractionsCalc:
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1/27 + 10/21 = 97/189

Simplified Fraction

97/189

Mixed Number

Proper (97/189)

Decimal Value

0.513228

Percentage

51.3228%

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Step-by-Step Solution: 1/27 + 10/21

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 1/27 by 7, and multiply the numerator and denominator of 10/21 by 9 so both fractions share the common base 189.

1 × 7/27 × 7 = 7/189 and 10 × 9/21 × 9 = 90/189

Step 3

Add the Numerators

Now add the numerators (7 + 90 = 97) and keep the common denominator 189 unchanged.

7 + 90/189 = 97/189

Step 4

Check if the Fraction Can Be Simplified

The Greatest Common Divisor (GCD) of 97 and 189 is 1, confirming that 97/189 cannot be reduced further—it is already in its simplest irreducible form.

97/189

Step 5

Decimal & Percentage Representation

Dividing the numerator 97 by denominator 189 produces a repeating decimal (approximately 0.513228, or 51.3228%).

97 ÷ 189 = 0.513228 (51.3228%)

Visual Representation

The diagram below illustrates 1/27 plus 10/21 visually:

Summary & Alternative Representations

Property / Format	Value
Lowest Terms Fraction	`97/189`
Mixed Number Form	`97/189`
Decimal Form	`0.513228`
Percentage	`51.3228%`

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Frequently Asked Questions

What is 1/27 plus 10/21 as a fraction?

1/27 + 10/21 in simplest fraction form is 97/189.

What is 1/27 plus 10/21 as a decimal?

1/27 + 10/21 converted to a decimal is 0.513228.

What is 1/27 plus 10/21 as a percentage?

1/27 + 10/21 expressed as a percentage is 51.3228%.

Does 1/27 plus 10/21 result in a terminating or repeating decimal?

It results in a repeating decimal (approximately 0.513228...) because the denominator contains prime factors other than 2 and 5.