What is 2/33 plus 7/21? (Answer: 13/33)

Exact Answer

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Problem: What is 2/33 plus 7/21?
Formula / Expression: 2/33 + 7/21
Final Answer: 13/33
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Step-by-Step Solution:

Step 1: Find the Least Common Denominator (LCD)
The denominators 33 and 21 share a common factor (GCD = 3). Finding their Least Common Multiple gives an LCD of 231 (which is smaller than their product 33 × 21 = 693, keeping the calculation simpler).
Working: LCD(33, 21) = 231

Step 2: Convert to Equivalent Fractions with Common Denominator 231
Multiply the numerator and denominator of 2/33 by 7, and multiply the numerator and denominator of 7/21 by 11 so both fractions share the common base 231.
Working: 2 × 7/33 × 7 = 14/231 and 7 × 11/21 × 11 = 77/231

Step 3: Add the Numerators
Now add the numerators (14 + 77 = 91) and keep the common denominator 231 unchanged.
Working: 14 + 77/231 = 91/231

Step 4: Simplify the Fraction to Lowest Terms
Find the Greatest Common Divisor (GCD) of 91 and 231, which is 7. Divide both the numerator and denominator by 7.
Working: 91 ÷ 7/231 ÷ 7 = 13/33

Step 5: Decimal & Percentage Representation
Dividing the numerator 13 by denominator 33 produces a repeating decimal (approximately 0.393939, or 39.3939%).
Working: 13 ÷ 33 = 0.393939 (39.3939%)

Key Values:
- Simplified Fraction: 13/33
- Mixed Number Form: 13/33
- Decimal Value: 0.393939
- Percentage: 39.3939%

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Solved with FractionsCalc:
https://fractionscalc.com/what-is-2-33-plus-7-21/
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2/33 + 7/21 = 13/33

Simplified Fraction

13/33

Mixed Number

Proper (13/33)

Decimal Value

0.393939

Percentage

39.3939%

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Step-by-Step Solution: 2/33 + 7/21

Step 1

Find the Least Common Denominator (LCD)

The denominators 33 and 21 share a common factor (GCD = 3). Finding their Least Common Multiple gives an LCD of 231 (which is smaller than their product 33 × 21 = 693, keeping the calculation simpler).

LCD(33, 21) = 231

Step 2

Convert to Equivalent Fractions with Common Denominator 231

Multiply the numerator and denominator of 2/33 by 7, and multiply the numerator and denominator of 7/21 by 11 so both fractions share the common base 231.

2 × 7/33 × 7 = 14/231 and 7 × 11/21 × 11 = 77/231

Step 3

Add the Numerators

Now add the numerators (14 + 77 = 91) and keep the common denominator 231 unchanged.

14 + 77/231 = 91/231

Step 4

Simplify the Fraction to Lowest Terms

Find the Greatest Common Divisor (GCD) of 91 and 231, which is 7. Divide both the numerator and denominator by 7.

91 ÷ 7/231 ÷ 7 = 13/33

Step 5

Decimal & Percentage Representation

Dividing the numerator 13 by denominator 33 produces a repeating decimal (approximately 0.393939, or 39.3939%).

13 ÷ 33 = 0.393939 (39.3939%)

Visual Representation

The diagram below illustrates 2/33 plus 7/21 visually:

Summary & Alternative Representations

Property / Format	Value
Lowest Terms Fraction	`13/33`
Mixed Number Form	`13/33`
Decimal Form	`0.393939`
Percentage	`39.3939%`

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Frequently Asked Questions

What is 2/33 plus 7/21 as a fraction?

2/33 + 7/21 in simplest fraction form is 13/33.

What is 2/33 plus 7/21 as a decimal?

2/33 + 7/21 converted to a decimal is 0.393939.

What is 2/33 plus 7/21 as a percentage?

2/33 + 7/21 expressed as a percentage is 39.3939%.

Does 2/33 plus 7/21 result in a terminating or repeating decimal?

It results in a repeating decimal (approximately 0.393939...) because the denominator contains prime factors other than 2 and 5.