What is 20/49 plus 9/21? (Answer: 41/49)

Exact Answer

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Problem: What is 20/49 plus 9/21?
Formula / Expression: 20/49 + 9/21
Final Answer: 41/49
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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 20/49 by 3, and multiply the numerator and denominator of 9/21 by 7 so both fractions share the common base 147.
Working: 20 × 3/49 × 3 = 60/147 and 9 × 7/21 × 7 = 63/147

Step 3: Add the Numerators
Now add the numerators (60 + 63 = 123) and keep the common denominator 147 unchanged.
Working: 60 + 63/147 = 123/147

Step 4: Simplify the Fraction to Lowest Terms
Find the Greatest Common Divisor (GCD) of 123 and 147, which is 3. Divide both the numerator and denominator by 3.
Working: 123 ÷ 3/147 ÷ 3 = 41/49

Step 5: Decimal & Percentage Representation
Dividing the numerator 41 by denominator 49 produces a repeating decimal (approximately 0.836735, or 83.6735%).
Working: 41 ÷ 49 = 0.836735 (83.6735%)

Key Values:
- Simplified Fraction: 41/49
- Mixed Number Form: 41/49
- Decimal Value: 0.836735
- Percentage: 83.6735%

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Solved with FractionsCalc:
https://fractionscalc.com/what-is-20-49-plus-9-21/
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20/49 + 9/21 = 41/49

Simplified Fraction

41/49

Mixed Number

Proper (41/49)

Decimal Value

0.836735

Percentage

83.6735%

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Step-by-Step Solution: 20/49 + 9/21

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 20/49 by 3, and multiply the numerator and denominator of 9/21 by 7 so both fractions share the common base 147.

20 × 3/49 × 3 = 60/147 and 9 × 7/21 × 7 = 63/147

Step 3

Add the Numerators

Now add the numerators (60 + 63 = 123) and keep the common denominator 147 unchanged.

60 + 63/147 = 123/147

Step 4

Simplify the Fraction to Lowest Terms

Find the Greatest Common Divisor (GCD) of 123 and 147, which is 3. Divide both the numerator and denominator by 3.

123 ÷ 3/147 ÷ 3 = 41/49

Step 5

Decimal & Percentage Representation

Dividing the numerator 41 by denominator 49 produces a repeating decimal (approximately 0.836735, or 83.6735%).

41 ÷ 49 = 0.836735 (83.6735%)

Visual Representation

The diagram below illustrates 20/49 plus 9/21 visually:

Summary & Alternative Representations

Property / Format	Value
Lowest Terms Fraction	`41/49`
Mixed Number Form	`41/49`
Decimal Form	`0.836735`
Percentage	`83.6735%`

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Frequently Asked Questions

What is 20/49 plus 9/21 as a fraction?

20/49 + 9/21 in simplest fraction form is 41/49.

What is 20/49 plus 9/21 as a decimal?

20/49 + 9/21 converted to a decimal is 0.836735.

What is 20/49 plus 9/21 as a percentage?

20/49 + 9/21 expressed as a percentage is 83.6735%.

Does 20/49 plus 9/21 result in a terminating or repeating decimal?

It results in a repeating decimal (approximately 0.836735...) because the denominator contains prime factors other than 2 and 5.