What is 7/35 plus 6/21? (Answer: 17/35)

Exact Answer

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Problem: What is 7/35 plus 6/21?
Formula / Expression: 7/35 + 6/21
Final Answer: 17/35
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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 7/35 by 3, and multiply the numerator and denominator of 6/21 by 5 so both fractions share the common base 105.
Working: 7 × 3/35 × 3 = 21/105 and 6 × 5/21 × 5 = 30/105

Step 3: Add the Numerators
Now add the numerators (21 + 30 = 51) and keep the common denominator 105 unchanged.
Working: 21 + 30/105 = 51/105

Step 4: Simplify the Fraction to Lowest Terms
Find the Greatest Common Divisor (GCD) of 51 and 105, which is 3. Divide both the numerator and denominator by 3.
Working: 51 ÷ 3/105 ÷ 3 = 17/35

Step 5: Decimal & Percentage Representation
Dividing the numerator 17 by denominator 35 produces a repeating decimal (approximately 0.485714, or 48.5714%).
Working: 17 ÷ 35 = 0.485714 (48.5714%)

Key Values:
- Simplified Fraction: 17/35
- Mixed Number Form: 17/35
- Decimal Value: 0.485714
- Percentage: 48.5714%

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Solved with FractionsCalc:
https://fractionscalc.com/what-is-7-35-plus-6-21/
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7/35 + 6/21 = 17/35

Simplified Fraction

17/35

Mixed Number

Proper (17/35)

Decimal Value

0.485714

Percentage

48.5714%

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Step-by-Step Solution: 7/35 + 6/21

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 7/35 by 3, and multiply the numerator and denominator of 6/21 by 5 so both fractions share the common base 105.

7 × 3/35 × 3 = 21/105 and 6 × 5/21 × 5 = 30/105

Step 3

Add the Numerators

Now add the numerators (21 + 30 = 51) and keep the common denominator 105 unchanged.

21 + 30/105 = 51/105

Step 4

Simplify the Fraction to Lowest Terms

Find the Greatest Common Divisor (GCD) of 51 and 105, which is 3. Divide both the numerator and denominator by 3.

51 ÷ 3/105 ÷ 3 = 17/35

Step 5

Decimal & Percentage Representation

Dividing the numerator 17 by denominator 35 produces a repeating decimal (approximately 0.485714, or 48.5714%).

17 ÷ 35 = 0.485714 (48.5714%)

Visual Representation

The diagram below illustrates 7/35 plus 6/21 visually:

Summary & Alternative Representations

Property / Format	Value
Lowest Terms Fraction	`17/35`
Mixed Number Form	`17/35`
Decimal Form	`0.485714`
Percentage	`48.5714%`

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Frequently Asked Questions

What is 7/35 plus 6/21 as a fraction?

7/35 + 6/21 in simplest fraction form is 17/35.

What is 7/35 plus 6/21 as a decimal?

7/35 + 6/21 converted to a decimal is 0.485714.

What is 7/35 plus 6/21 as a percentage?

7/35 + 6/21 expressed as a percentage is 48.5714%.

Does 7/35 plus 6/21 result in a terminating or repeating decimal?

It results in a repeating decimal (approximately 0.485714...) because the denominator contains prime factors other than 2 and 5.