What is 20/41 plus 11/21? (Answer: 871/861)

Exact Answer

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Problem: What is 20/41 plus 11/21?
Formula / Expression: 20/41 + 11/21
Final Answer: 1 10/861 (871/861)
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Step-by-Step Solution:

Step 1: Find the Least Common Denominator (LCD)
The denominators 41 and 21 are coprime (they share no common factors other than 1). Therefore, their Least Common Denominator (LCD) is simply their direct product: 41 × 21 = 861.
Working: LCD(41, 21) = 861

Step 2: Convert to Equivalent Fractions with Common Denominator 861
Multiply the numerator and denominator of 20/41 by 21, and multiply the numerator and denominator of 11/21 by 41 so both fractions share the common base 861.
Working: 20 × 21/41 × 21 = 420/861 and 11 × 41/21 × 41 = 451/861

Step 3: Add the Numerators
Now add the numerators (420 + 451 = 871) and keep the common denominator 861 unchanged.
Working: 420 + 451/861 = 871/861

Step 4: Check if the Fraction Can Be Simplified
The Greatest Common Divisor (GCD) of 871 and 861 is 1, confirming that 871/861 cannot be reduced further—it is already in its simplest irreducible form.
Working: 871/861

Step 5: Convert Improper Fraction to a Mixed Number
Since the numerator (871) is greater than the denominator (861), divide 871 by 861: it goes in 1 whole time(s) with a remainder of 10, giving the mixed number 1 10/861.
Working: 871/861 = 1 10/861

Step 6: Decimal & Percentage Representation
Dividing the numerator 871 by denominator 861 produces a repeating decimal (approximately 1.011614, or 101.1614%).
Working: 871 ÷ 861 = 1.011614 (101.1614%)

Key Values:
- Simplified Fraction: 871/861
- Mixed Number Form: 1 10/861
- Decimal Value: 1.011614
- Percentage: 101.1614%

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Solved with FractionsCalc:
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20/41 + 11/21 = 871/861

Simplified Fraction

871/861

Mixed Number

1 10/861

Decimal Value

1.011614

Percentage

101.1614%

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Step-by-Step Solution: 20/41 + 11/21

Step 1

Find the Least Common Denominator (LCD)

The denominators 41 and 21 are coprime (they share no common factors other than 1). Therefore, their Least Common Denominator (LCD) is simply their direct product: 41 × 21 = 861.

LCD(41, 21) = 861

Step 2

Convert to Equivalent Fractions with Common Denominator 861

Multiply the numerator and denominator of 20/41 by 21, and multiply the numerator and denominator of 11/21 by 41 so both fractions share the common base 861.

20 × 21/41 × 21 = 420/861 and 11 × 41/21 × 41 = 451/861

Step 3

Add the Numerators

Now add the numerators (420 + 451 = 871) and keep the common denominator 861 unchanged.

420 + 451/861 = 871/861

Step 4

Check if the Fraction Can Be Simplified

The Greatest Common Divisor (GCD) of 871 and 861 is 1, confirming that 871/861 cannot be reduced further—it is already in its simplest irreducible form.

871/861

Step 5

Convert Improper Fraction to a Mixed Number

Since the numerator (871) is greater than the denominator (861), divide 871 by 861: it goes in 1 whole time(s) with a remainder of 10, giving the mixed number 1 10/861.

871/861 = 110/861

Step 6

Decimal & Percentage Representation

Dividing the numerator 871 by denominator 861 produces a repeating decimal (approximately 1.011614, or 101.1614%).

871 ÷ 861 = 1.011614 (101.1614%)

Visual Representation

The diagram below illustrates 20/41 plus 11/21 visually:

Summary & Alternative Representations

Property / Format	Value
Lowest Terms Fraction	`871/861`
Mixed Number Form	`1 10/861`
Decimal Form	`1.011614`
Percentage	`101.1614%`

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Frequently Asked Questions

What is 20/41 plus 11/21 as a fraction?

20/41 + 11/21 in simplest fraction form is 871/861 (or 1 10/861 as a mixed number).

What is 20/41 plus 11/21 as a decimal?

20/41 + 11/21 converted to a decimal is 1.011614.

What is 20/41 plus 11/21 as a percentage?

20/41 + 11/21 expressed as a percentage is 101.1614%.

How do you write 20/41 plus 11/21 as a mixed number?

Because the numerator is greater than the denominator, the improper fraction 871/861 can be written as the mixed number 1 10/861.

Does 20/41 plus 11/21 result in a terminating or repeating decimal?

It results in a repeating decimal (approximately 1.011614...) because the denominator contains prime factors other than 2 and 5.