What is 13/35 plus 11/21? (Answer: 94/105)

Exact Answer

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Problem: What is 13/35 plus 11/21?
Formula / Expression: 13/35 + 11/21
Final Answer: 94/105
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Step-by-Step Solution:

Step 1: Find the Least Common Denominator (LCD)
The denominators 35 and 21 share a common factor (GCD = 7). Finding their Least Common Multiple gives an LCD of 105 (which is smaller than their product 35 × 21 = 735, keeping the calculation simpler).
Working: LCD(35, 21) = 105

Step 2: Convert to Equivalent Fractions with Common Denominator 105
Multiply the numerator and denominator of 13/35 by 3, and multiply the numerator and denominator of 11/21 by 5 so both fractions share the common base 105.
Working: 13 × 3/35 × 3 = 39/105 and 11 × 5/21 × 5 = 55/105

Step 3: Add the Numerators
Now add the numerators (39 + 55 = 94) and keep the common denominator 105 unchanged.
Working: 39 + 55/105 = 94/105

Step 4: Check if the Fraction Can Be Simplified
The Greatest Common Divisor (GCD) of 94 and 105 is 1, confirming that 94/105 cannot be reduced further—it is already in its simplest irreducible form.
Working: 94/105

Step 5: Decimal & Percentage Representation
Dividing the numerator 94 by denominator 105 produces a repeating decimal (approximately 0.895238, or 89.5238%).
Working: 94 ÷ 105 = 0.895238 (89.5238%)

Key Values:
- Simplified Fraction: 94/105
- Mixed Number Form: 94/105
- Decimal Value: 0.895238
- Percentage: 89.5238%

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Solved with FractionsCalc:
https://fractionscalc.com/what-is-13-35-plus-11-21/
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13/35 + 11/21 = 94/105

Simplified Fraction

94/105

Mixed Number

Proper (94/105)

Decimal Value

0.895238

Percentage

89.5238%

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Step-by-Step Solution: 13/35 + 11/21

Step 1

Find the Least Common Denominator (LCD)

The denominators 35 and 21 share a common factor (GCD = 7). Finding their Least Common Multiple gives an LCD of 105 (which is smaller than their product 35 × 21 = 735, keeping the calculation simpler).

LCD(35, 21) = 105

Step 2

Convert to Equivalent Fractions with Common Denominator 105

Multiply the numerator and denominator of 13/35 by 3, and multiply the numerator and denominator of 11/21 by 5 so both fractions share the common base 105.

13 × 3/35 × 3 = 39/105 and 11 × 5/21 × 5 = 55/105

Step 3

Add the Numerators

Now add the numerators (39 + 55 = 94) and keep the common denominator 105 unchanged.

39 + 55/105 = 94/105

Step 4

Check if the Fraction Can Be Simplified

The Greatest Common Divisor (GCD) of 94 and 105 is 1, confirming that 94/105 cannot be reduced further—it is already in its simplest irreducible form.

94/105

Step 5

Decimal & Percentage Representation

Dividing the numerator 94 by denominator 105 produces a repeating decimal (approximately 0.895238, or 89.5238%).

94 ÷ 105 = 0.895238 (89.5238%)

Visual Representation

The diagram below illustrates 13/35 plus 11/21 visually:

Summary & Alternative Representations

Property / Format	Value
Lowest Terms Fraction	`94/105`
Mixed Number Form	`94/105`
Decimal Form	`0.895238`
Percentage	`89.5238%`

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Frequently Asked Questions

What is 13/35 plus 11/21 as a fraction?

13/35 + 11/21 in simplest fraction form is 94/105.

What is 13/35 plus 11/21 as a decimal?

13/35 + 11/21 converted to a decimal is 0.895238.

What is 13/35 plus 11/21 as a percentage?

13/35 + 11/21 expressed as a percentage is 89.5238%.

Does 13/35 plus 11/21 result in a terminating or repeating decimal?

It results in a repeating decimal (approximately 0.895238...) because the denominator contains prime factors other than 2 and 5.