What is 1/49 plus 2/21? (Answer: 17/147)

Exact Answer

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Problem: What is 1/49 plus 2/21?
Formula / Expression: 1/49 + 2/21
Final Answer: 17/147
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Step-by-Step Solution:

Step 1: Find the Least Common Denominator (LCD)
The denominators 49 and 21 share a common factor (GCD = 7). Finding their Least Common Multiple gives an LCD of 147 (which is smaller than their product 49 × 21 = 1029, keeping the calculation simpler).
Working: LCD(49, 21) = 147

Step 2: Convert to Equivalent Fractions with Common Denominator 147
Multiply the numerator and denominator of 1/49 by 3, and multiply the numerator and denominator of 2/21 by 7 so both fractions share the common base 147.
Working: 1 × 3/49 × 3 = 3/147 and 2 × 7/21 × 7 = 14/147

Step 3: Add the Numerators
Now add the numerators (3 + 14 = 17) and keep the common denominator 147 unchanged.
Working: 3 + 14/147 = 17/147

Step 4: Check if the Fraction Can Be Simplified
The Greatest Common Divisor (GCD) of 17 and 147 is 1, confirming that 17/147 cannot be reduced further—it is already in its simplest irreducible form.
Working: 17/147

Step 5: Decimal & Percentage Representation
Dividing the numerator 17 by denominator 147 produces a repeating decimal (approximately 0.115646, or 11.5646%).
Working: 17 ÷ 147 = 0.115646 (11.5646%)

Key Values:
- Simplified Fraction: 17/147
- Mixed Number Form: 17/147
- Decimal Value: 0.115646
- Percentage: 11.5646%

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1/49 + 2/21 = 17/147

Simplified Fraction

17/147

Mixed Number

Proper (17/147)

Decimal Value

0.115646

Percentage

11.5646%

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Step-by-Step Solution: 1/49 + 2/21

Step 1

Find the Least Common Denominator (LCD)

The denominators 49 and 21 share a common factor (GCD = 7). Finding their Least Common Multiple gives an LCD of 147 (which is smaller than their product 49 × 21 = 1029, keeping the calculation simpler).

LCD(49, 21) = 147

Step 2

Convert to Equivalent Fractions with Common Denominator 147

Multiply the numerator and denominator of 1/49 by 3, and multiply the numerator and denominator of 2/21 by 7 so both fractions share the common base 147.

1 × 3/49 × 3 = 3/147 and 2 × 7/21 × 7 = 14/147

Step 3

Add the Numerators

Now add the numerators (3 + 14 = 17) and keep the common denominator 147 unchanged.

3 + 14/147 = 17/147

Step 4

Check if the Fraction Can Be Simplified

The Greatest Common Divisor (GCD) of 17 and 147 is 1, confirming that 17/147 cannot be reduced further—it is already in its simplest irreducible form.

17/147

Step 5

Decimal & Percentage Representation

Dividing the numerator 17 by denominator 147 produces a repeating decimal (approximately 0.115646, or 11.5646%).

17 ÷ 147 = 0.115646 (11.5646%)

Visual Representation

The diagram below illustrates 1/49 plus 2/21 visually:

Summary & Alternative Representations

Property / Format	Value
Lowest Terms Fraction	`17/147`
Mixed Number Form	`17/147`
Decimal Form	`0.115646`
Percentage	`11.5646%`

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Frequently Asked Questions

What is 1/49 plus 2/21 as a fraction?

1/49 + 2/21 in simplest fraction form is 17/147.

What is 1/49 plus 2/21 as a decimal?

1/49 + 2/21 converted to a decimal is 0.115646.

What is 1/49 plus 2/21 as a percentage?

1/49 + 2/21 expressed as a percentage is 11.5646%.

Does 1/49 plus 2/21 result in a terminating or repeating decimal?

It results in a repeating decimal (approximately 0.115646...) because the denominator contains prime factors other than 2 and 5.