What is 2/21 plus 2/6? (Answer: 3/7)

Exact Answer

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Problem: What is 2/21 plus 2/6?
Formula / Expression: 2/21 + 2/6
Final Answer: 3/7
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Step-by-Step Solution:

Step 1: Find the Least Common Denominator (LCD)
The denominators 21 and 6 share a common factor (GCD = 3). Finding their Least Common Multiple gives an LCD of 42 (which is smaller than their product 21 × 6 = 126, keeping the calculation simpler).
Working: LCD(21, 6) = 42

Step 2: Convert to Equivalent Fractions with Common Denominator 42
Multiply the numerator and denominator of 2/21 by 2, and multiply the numerator and denominator of 2/6 by 7 so both fractions share the common base 42.
Working: 2 × 2/21 × 2 = 4/42 and 2 × 7/6 × 7 = 14/42

Step 3: Add the Numerators
Now add the numerators (4 + 14 = 18) and keep the common denominator 42 unchanged.
Working: 4 + 14/42 = 18/42

Step 4: Simplify the Fraction to Lowest Terms
Find the Greatest Common Divisor (GCD) of 18 and 42, which is 6. Divide both the numerator and denominator by 6.
Working: 18 ÷ 6/42 ÷ 6 = 3/7

Step 5: Decimal & Percentage Representation
Dividing the numerator 3 by denominator 7 produces a repeating decimal (approximately 0.428571, or 42.8571%).
Working: 3 ÷ 7 = 0.428571 (42.8571%)

Key Values:
- Simplified Fraction: 3/7
- Mixed Number Form: 3/7
- Decimal Value: 0.428571
- Percentage: 42.8571%

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Solved with FractionsCalc:
https://fractionscalc.com/what-is-2-21-plus-2-6/
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2/21 + 2/6 = 3/7

Simplified Fraction

3/7

Mixed Number

Proper (3/7)

Decimal Value

0.428571

Percentage

42.8571%

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Step-by-Step Solution: 2/21 + 2/6

Step 1

Find the Least Common Denominator (LCD)

The denominators 21 and 6 share a common factor (GCD = 3). Finding their Least Common Multiple gives an LCD of 42 (which is smaller than their product 21 × 6 = 126, keeping the calculation simpler).

LCD(21, 6) = 42

Step 2

Convert to Equivalent Fractions with Common Denominator 42

Multiply the numerator and denominator of 2/21 by 2, and multiply the numerator and denominator of 2/6 by 7 so both fractions share the common base 42.

2 × 2/21 × 2 = 4/42 and 2 × 7/6 × 7 = 14/42

Step 3

Add the Numerators

Now add the numerators (4 + 14 = 18) and keep the common denominator 42 unchanged.

4 + 14/42 = 18/42

Step 4

Simplify the Fraction to Lowest Terms

Find the Greatest Common Divisor (GCD) of 18 and 42, which is 6. Divide both the numerator and denominator by 6.

18 ÷ 6/42 ÷ 6 = 3/7

Step 5

Decimal & Percentage Representation

Dividing the numerator 3 by denominator 7 produces a repeating decimal (approximately 0.428571, or 42.8571%).

3 ÷ 7 = 0.428571 (42.8571%)

Visual Representation

The diagram below illustrates 2/21 plus 2/6 visually:

Summary & Alternative Representations

Property / Format	Value
Lowest Terms Fraction	`3/7`
Mixed Number Form	`3/7`
Decimal Form	`0.428571`
Percentage	`42.8571%`

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Frequently Asked Questions

What is 2/21 plus 2/6 as a fraction?

2/21 + 2/6 in simplest fraction form is 3/7.

What is 2/21 plus 2/6 as a decimal?

2/21 + 2/6 converted to a decimal is 0.428571.

What is 2/21 plus 2/6 as a percentage?

2/21 + 2/6 expressed as a percentage is 42.8571%.

Does 2/21 plus 2/6 result in a terminating or repeating decimal?

It results in a repeating decimal (approximately 0.428571...) because the denominator contains prime factors other than 2 and 5.