What is 1/35 plus 5/21? (Answer: 4/15)

Exact Answer

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Problem: What is 1/35 plus 5/21?
Formula / Expression: 1/35 + 5/21
Final Answer: 4/15
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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 1/35 by 3, and multiply the numerator and denominator of 5/21 by 5 so both fractions share the common base 105.
Working: 1 × 3/35 × 3 = 3/105 and 5 × 5/21 × 5 = 25/105

Step 3: Add the Numerators
Now add the numerators (3 + 25 = 28) and keep the common denominator 105 unchanged.
Working: 3 + 25/105 = 28/105

Step 4: Simplify the Fraction to Lowest Terms
Find the Greatest Common Divisor (GCD) of 28 and 105, which is 7. Divide both the numerator and denominator by 7.
Working: 28 ÷ 7/105 ÷ 7 = 4/15

Step 5: Decimal & Percentage Representation
Dividing the numerator 4 by denominator 15 produces a repeating decimal (approximately 0.266667, or 26.6667%).
Working: 4 ÷ 15 = 0.266667 (26.6667%)

Key Values:
- Simplified Fraction: 4/15
- Mixed Number Form: 4/15
- Decimal Value: 0.266667
- Percentage: 26.6667%

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Solved with FractionsCalc:
https://fractionscalc.com/what-is-1-35-plus-5-21/
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1/35 + 5/21 = 4/15

Simplified Fraction

4/15

Mixed Number

Proper (4/15)

Decimal Value

0.266667

Percentage

26.6667%

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Step-by-Step Solution: 1/35 + 5/21

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 1/35 by 3, and multiply the numerator and denominator of 5/21 by 5 so both fractions share the common base 105.

1 × 3/35 × 3 = 3/105 and 5 × 5/21 × 5 = 25/105

Step 3

Add the Numerators

Now add the numerators (3 + 25 = 28) and keep the common denominator 105 unchanged.

3 + 25/105 = 28/105

Step 4

Simplify the Fraction to Lowest Terms

Find the Greatest Common Divisor (GCD) of 28 and 105, which is 7. Divide both the numerator and denominator by 7.

28 ÷ 7/105 ÷ 7 = 4/15

Step 5

Decimal & Percentage Representation

Dividing the numerator 4 by denominator 15 produces a repeating decimal (approximately 0.266667, or 26.6667%).

4 ÷ 15 = 0.266667 (26.6667%)

Visual Representation

The diagram below illustrates 1/35 plus 5/21 visually:

Summary & Alternative Representations

Property / Format	Value
Lowest Terms Fraction	`4/15`
Mixed Number Form	`4/15`
Decimal Form	`0.266667`
Percentage	`26.6667%`

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Frequently Asked Questions

What is 1/35 plus 5/21 as a fraction?

1/35 + 5/21 in simplest fraction form is 4/15.

What is 1/35 plus 5/21 as a decimal?

1/35 + 5/21 converted to a decimal is 0.266667.

What is 1/35 plus 5/21 as a percentage?

1/35 + 5/21 expressed as a percentage is 26.6667%.

Does 1/35 plus 5/21 result in a terminating or repeating decimal?

It results in a repeating decimal (approximately 0.266667...) because the denominator contains prime factors other than 2 and 5.