What is 14/45 plus 7/21? (Answer: 29/45)

Exact Answer

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Problem: What is 14/45 plus 7/21?
Formula / Expression: 14/45 + 7/21
Final Answer: 29/45
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Step-by-Step Solution:

Step 1: Find the Least Common Denominator (LCD)
The denominators 45 and 21 share a common factor (GCD = 3). Finding their Least Common Multiple gives an LCD of 315 (which is smaller than their product 45 × 21 = 945, keeping the calculation simpler).
Working: LCD(45, 21) = 315

Step 2: Convert to Equivalent Fractions with Common Denominator 315
Multiply the numerator and denominator of 14/45 by 7, and multiply the numerator and denominator of 7/21 by 15 so both fractions share the common base 315.
Working: 14 × 7/45 × 7 = 98/315 and 7 × 15/21 × 15 = 105/315

Step 3: Add the Numerators
Now add the numerators (98 + 105 = 203) and keep the common denominator 315 unchanged.
Working: 98 + 105/315 = 203/315

Step 4: Simplify the Fraction to Lowest Terms
Find the Greatest Common Divisor (GCD) of 203 and 315, which is 7. Divide both the numerator and denominator by 7.
Working: 203 ÷ 7/315 ÷ 7 = 29/45

Step 5: Decimal & Percentage Representation
Dividing the numerator 29 by denominator 45 produces a repeating decimal (approximately 0.644444, or 64.4444%).
Working: 29 ÷ 45 = 0.644444 (64.4444%)

Key Values:
- Simplified Fraction: 29/45
- Mixed Number Form: 29/45
- Decimal Value: 0.644444
- Percentage: 64.4444%

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Solved with FractionsCalc:
https://fractionscalc.com/what-is-14-45-plus-7-21/
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14/45 + 7/21 = 29/45

Simplified Fraction

29/45

Mixed Number

Proper (29/45)

Decimal Value

0.644444

Percentage

64.4444%

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Step-by-Step Solution: 14/45 + 7/21

Step 1

Find the Least Common Denominator (LCD)

The denominators 45 and 21 share a common factor (GCD = 3). Finding their Least Common Multiple gives an LCD of 315 (which is smaller than their product 45 × 21 = 945, keeping the calculation simpler).

LCD(45, 21) = 315

Step 2

Convert to Equivalent Fractions with Common Denominator 315

Multiply the numerator and denominator of 14/45 by 7, and multiply the numerator and denominator of 7/21 by 15 so both fractions share the common base 315.

14 × 7/45 × 7 = 98/315 and 7 × 15/21 × 15 = 105/315

Step 3

Add the Numerators

Now add the numerators (98 + 105 = 203) and keep the common denominator 315 unchanged.

98 + 105/315 = 203/315

Step 4

Simplify the Fraction to Lowest Terms

Find the Greatest Common Divisor (GCD) of 203 and 315, which is 7. Divide both the numerator and denominator by 7.

203 ÷ 7/315 ÷ 7 = 29/45

Step 5

Decimal & Percentage Representation

Dividing the numerator 29 by denominator 45 produces a repeating decimal (approximately 0.644444, or 64.4444%).

29 ÷ 45 = 0.644444 (64.4444%)

Visual Representation

The diagram below illustrates 14/45 plus 7/21 visually:

Summary & Alternative Representations

Property / Format	Value
Lowest Terms Fraction	`29/45`
Mixed Number Form	`29/45`
Decimal Form	`0.644444`
Percentage	`64.4444%`

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Frequently Asked Questions

What is 14/45 plus 7/21 as a fraction?

14/45 + 7/21 in simplest fraction form is 29/45.

What is 14/45 plus 7/21 as a decimal?

14/45 + 7/21 converted to a decimal is 0.644444.

What is 14/45 plus 7/21 as a percentage?

14/45 + 7/21 expressed as a percentage is 64.4444%.

Does 14/45 plus 7/21 result in a terminating or repeating decimal?

It results in a repeating decimal (approximately 0.644444...) because the denominator contains prime factors other than 2 and 5.