What is 3/54 plus 2/21? (Answer: 19/126)

Exact Answer

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Problem: What is 3/54 plus 2/21?
Formula / Expression: 3/54 + 2/21
Final Answer: 19/126
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Step-by-Step Solution:

Step 1: Find the Least Common Denominator (LCD)
The denominators 54 and 21 share a common factor (GCD = 3). Finding their Least Common Multiple gives an LCD of 378 (which is smaller than their product 54 × 21 = 1134, keeping the calculation simpler).
Working: LCD(54, 21) = 378

Step 2: Convert to Equivalent Fractions with Common Denominator 378
Multiply the numerator and denominator of 3/54 by 7, and multiply the numerator and denominator of 2/21 by 18 so both fractions share the common base 378.
Working: 3 × 7/54 × 7 = 21/378 and 2 × 18/21 × 18 = 36/378

Step 3: Add the Numerators
Now add the numerators (21 + 36 = 57) and keep the common denominator 378 unchanged.
Working: 21 + 36/378 = 57/378

Step 4: Simplify the Fraction to Lowest Terms
Find the Greatest Common Divisor (GCD) of 57 and 378, which is 3. Divide both the numerator and denominator by 3.
Working: 57 ÷ 3/378 ÷ 3 = 19/126

Step 5: Decimal & Percentage Representation
Dividing the numerator 19 by denominator 126 produces a repeating decimal (approximately 0.150794, or 15.0794%).
Working: 19 ÷ 126 = 0.150794 (15.0794%)

Key Values:
- Simplified Fraction: 19/126
- Mixed Number Form: 19/126
- Decimal Value: 0.150794
- Percentage: 15.0794%

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Solved with FractionsCalc:
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3/54 + 2/21 = 19/126

Simplified Fraction

19/126

Mixed Number

Proper (19/126)

Decimal Value

0.150794

Percentage

15.0794%

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Step-by-Step Solution: 3/54 + 2/21

Step 1

Find the Least Common Denominator (LCD)

The denominators 54 and 21 share a common factor (GCD = 3). Finding their Least Common Multiple gives an LCD of 378 (which is smaller than their product 54 × 21 = 1134, keeping the calculation simpler).

LCD(54, 21) = 378

Step 2

Convert to Equivalent Fractions with Common Denominator 378

Multiply the numerator and denominator of 3/54 by 7, and multiply the numerator and denominator of 2/21 by 18 so both fractions share the common base 378.

3 × 7/54 × 7 = 21/378 and 2 × 18/21 × 18 = 36/378

Step 3

Add the Numerators

Now add the numerators (21 + 36 = 57) and keep the common denominator 378 unchanged.

21 + 36/378 = 57/378

Step 4

Simplify the Fraction to Lowest Terms

Find the Greatest Common Divisor (GCD) of 57 and 378, which is 3. Divide both the numerator and denominator by 3.

57 ÷ 3/378 ÷ 3 = 19/126

Step 5

Decimal & Percentage Representation

Dividing the numerator 19 by denominator 126 produces a repeating decimal (approximately 0.150794, or 15.0794%).

19 ÷ 126 = 0.150794 (15.0794%)

Visual Representation

The diagram below illustrates 3/54 plus 2/21 visually:

Summary & Alternative Representations

Property / Format	Value
Lowest Terms Fraction	`19/126`
Mixed Number Form	`19/126`
Decimal Form	`0.150794`
Percentage	`15.0794%`

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Frequently Asked Questions

What is 3/54 plus 2/21 as a fraction?

3/54 + 2/21 in simplest fraction form is 19/126.

What is 3/54 plus 2/21 as a decimal?

3/54 + 2/21 converted to a decimal is 0.150794.

What is 3/54 plus 2/21 as a percentage?

3/54 + 2/21 expressed as a percentage is 15.0794%.

Does 3/54 plus 2/21 result in a terminating or repeating decimal?

It results in a repeating decimal (approximately 0.150794...) because the denominator contains prime factors other than 2 and 5.