What is 1/35 plus 3/21? (Answer: 6/35)

Exact Answer

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Problem: What is 1/35 plus 3/21?
Formula / Expression: 1/35 + 3/21
Final Answer: 6/35
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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 3/21 by 5 so both fractions share the common base 105.
Working: 1 × 3/35 × 3 = 3/105 and 3 × 5/21 × 5 = 15/105

Step 3: Add the Numerators
Now add the numerators (3 + 15 = 18) and keep the common denominator 105 unchanged.
Working: 3 + 15/105 = 18/105

Step 4: Simplify the Fraction to Lowest Terms
Find the Greatest Common Divisor (GCD) of 18 and 105, which is 3. Divide both the numerator and denominator by 3.
Working: 18 ÷ 3/105 ÷ 3 = 6/35

Step 5: Decimal & Percentage Representation
Dividing the numerator 6 by denominator 35 produces a repeating decimal (approximately 0.171429, or 17.1429%).
Working: 6 ÷ 35 = 0.171429 (17.1429%)

Key Values:
- Simplified Fraction: 6/35
- Mixed Number Form: 6/35
- Decimal Value: 0.171429
- Percentage: 17.1429%

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Solved with FractionsCalc:
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1/35 + 3/21 = 6/35

Simplified Fraction

6/35

Mixed Number

Proper (6/35)

Decimal Value

0.171429

Percentage

17.1429%

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Step-by-Step Solution: 1/35 + 3/21

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 3/21 by 5 so both fractions share the common base 105.

1 × 3/35 × 3 = 3/105 and 3 × 5/21 × 5 = 15/105

Step 3

Add the Numerators

Now add the numerators (3 + 15 = 18) and keep the common denominator 105 unchanged.

3 + 15/105 = 18/105

Step 4

Simplify the Fraction to Lowest Terms

Find the Greatest Common Divisor (GCD) of 18 and 105, which is 3. Divide both the numerator and denominator by 3.

18 ÷ 3/105 ÷ 3 = 6/35

Step 5

Decimal & Percentage Representation

Dividing the numerator 6 by denominator 35 produces a repeating decimal (approximately 0.171429, or 17.1429%).

6 ÷ 35 = 0.171429 (17.1429%)

Visual Representation

The diagram below illustrates 1/35 plus 3/21 visually:

Summary & Alternative Representations

Property / Format	Value
Lowest Terms Fraction	`6/35`
Mixed Number Form	`6/35`
Decimal Form	`0.171429`
Percentage	`17.1429%`

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Frequently Asked Questions

What is 1/35 plus 3/21 as a fraction?

1/35 + 3/21 in simplest fraction form is 6/35.

What is 1/35 plus 3/21 as a decimal?

1/35 + 3/21 converted to a decimal is 0.171429.

What is 1/35 plus 3/21 as a percentage?

1/35 + 3/21 expressed as a percentage is 17.1429%.

Does 1/35 plus 3/21 result in a terminating or repeating decimal?

It results in a repeating decimal (approximately 0.171429...) because the denominator contains prime factors other than 2 and 5.