What is 4/48 plus 5/21? (Answer: 9/28)

Exact Answer

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Problem: What is 4/48 plus 5/21?
Formula / Expression: 4/48 + 5/21
Final Answer: 9/28
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Step-by-Step Solution:

Step 1: Find the Least Common Denominator (LCD)
The denominators 48 and 21 share a common factor (GCD = 3). Finding their Least Common Multiple gives an LCD of 336 (which is smaller than their product 48 × 21 = 1008, keeping the calculation simpler).
Working: LCD(48, 21) = 336

Step 2: Convert to Equivalent Fractions with Common Denominator 336
Multiply the numerator and denominator of 4/48 by 7, and multiply the numerator and denominator of 5/21 by 16 so both fractions share the common base 336.
Working: 4 × 7/48 × 7 = 28/336 and 5 × 16/21 × 16 = 80/336

Step 3: Add the Numerators
Now add the numerators (28 + 80 = 108) and keep the common denominator 336 unchanged.
Working: 28 + 80/336 = 108/336

Step 4: Simplify the Fraction to Lowest Terms
Find the Greatest Common Divisor (GCD) of 108 and 336, which is 12. Divide both the numerator and denominator by 12.
Working: 108 ÷ 12/336 ÷ 12 = 9/28

Step 5: Decimal & Percentage Representation
Dividing the numerator 9 by denominator 28 produces a repeating decimal (approximately 0.321429, or 32.1429%).
Working: 9 ÷ 28 = 0.321429 (32.1429%)

Key Values:
- Simplified Fraction: 9/28
- Mixed Number Form: 9/28
- Decimal Value: 0.321429
- Percentage: 32.1429%

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Solved with FractionsCalc:
https://fractionscalc.com/what-is-4-48-plus-5-21/
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4/48 + 5/21 = 9/28

Simplified Fraction

9/28

Mixed Number

Proper (9/28)

Decimal Value

0.321429

Percentage

32.1429%

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Step-by-Step Solution: 4/48 + 5/21

Step 1

Find the Least Common Denominator (LCD)

The denominators 48 and 21 share a common factor (GCD = 3). Finding their Least Common Multiple gives an LCD of 336 (which is smaller than their product 48 × 21 = 1008, keeping the calculation simpler).

LCD(48, 21) = 336

Step 2

Convert to Equivalent Fractions with Common Denominator 336

Multiply the numerator and denominator of 4/48 by 7, and multiply the numerator and denominator of 5/21 by 16 so both fractions share the common base 336.

4 × 7/48 × 7 = 28/336 and 5 × 16/21 × 16 = 80/336

Step 3

Add the Numerators

Now add the numerators (28 + 80 = 108) and keep the common denominator 336 unchanged.

28 + 80/336 = 108/336

Step 4

Simplify the Fraction to Lowest Terms

Find the Greatest Common Divisor (GCD) of 108 and 336, which is 12. Divide both the numerator and denominator by 12.

108 ÷ 12/336 ÷ 12 = 9/28

Step 5

Decimal & Percentage Representation

Dividing the numerator 9 by denominator 28 produces a repeating decimal (approximately 0.321429, or 32.1429%).

9 ÷ 28 = 0.321429 (32.1429%)

Visual Representation

The diagram below illustrates 4/48 plus 5/21 visually:

Summary & Alternative Representations

Property / Format	Value
Lowest Terms Fraction	`9/28`
Mixed Number Form	`9/28`
Decimal Form	`0.321429`
Percentage	`32.1429%`

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Frequently Asked Questions

What is 4/48 plus 5/21 as a fraction?

4/48 + 5/21 in simplest fraction form is 9/28.

What is 4/48 plus 5/21 as a decimal?

4/48 + 5/21 converted to a decimal is 0.321429.

What is 4/48 plus 5/21 as a percentage?

4/48 + 5/21 expressed as a percentage is 32.1429%.

Does 4/48 plus 5/21 result in a terminating or repeating decimal?

It results in a repeating decimal (approximately 0.321429...) because the denominator contains prime factors other than 2 and 5.