What is 9/48 plus 5/21? (Answer: 143/336)

Exact Answer

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Problem: What is 9/48 plus 5/21?
Formula / Expression: 9/48 + 5/21
Final Answer: 143/336
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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 9/48 by 7, and multiply the numerator and denominator of 5/21 by 16 so both fractions share the common base 336.
Working: 9 × 7/48 × 7 = 63/336 and 5 × 16/21 × 16 = 80/336

Step 3: Add the Numerators
Now add the numerators (63 + 80 = 143) and keep the common denominator 336 unchanged.
Working: 63 + 80/336 = 143/336

Step 4: Check if the Fraction Can Be Simplified
The Greatest Common Divisor (GCD) of 143 and 336 is 1, confirming that 143/336 cannot be reduced further—it is already in its simplest irreducible form.
Working: 143/336

Step 5: Decimal & Percentage Representation
Dividing the numerator 143 by denominator 336 produces a repeating decimal (approximately 0.425595, or 42.5595%).
Working: 143 ÷ 336 = 0.425595 (42.5595%)

Key Values:
- Simplified Fraction: 143/336
- Mixed Number Form: 143/336
- Decimal Value: 0.425595
- Percentage: 42.5595%

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Solved with FractionsCalc:
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9/48 + 5/21 = 143/336

Simplified Fraction

143/336

Mixed Number

Proper (143/336)

Decimal Value

0.425595

Percentage

42.5595%

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Step-by-Step Solution: 9/48 + 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 9/48 by 7, and multiply the numerator and denominator of 5/21 by 16 so both fractions share the common base 336.

9 × 7/48 × 7 = 63/336 and 5 × 16/21 × 16 = 80/336

Step 3

Add the Numerators

Now add the numerators (63 + 80 = 143) and keep the common denominator 336 unchanged.

63 + 80/336 = 143/336

Step 4

Check if the Fraction Can Be Simplified

The Greatest Common Divisor (GCD) of 143 and 336 is 1, confirming that 143/336 cannot be reduced further—it is already in its simplest irreducible form.

143/336

Step 5

Decimal & Percentage Representation

Dividing the numerator 143 by denominator 336 produces a repeating decimal (approximately 0.425595, or 42.5595%).

143 ÷ 336 = 0.425595 (42.5595%)

Visual Representation

The diagram below illustrates 9/48 plus 5/21 visually:

Summary & Alternative Representations

Property / Format	Value
Lowest Terms Fraction	`143/336`
Mixed Number Form	`143/336`
Decimal Form	`0.425595`
Percentage	`42.5595%`

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Frequently Asked Questions

What is 9/48 plus 5/21 as a fraction?

9/48 + 5/21 in simplest fraction form is 143/336.

What is 9/48 plus 5/21 as a decimal?

9/48 + 5/21 converted to a decimal is 0.425595.

What is 9/48 plus 5/21 as a percentage?

9/48 + 5/21 expressed as a percentage is 42.5595%.

Does 9/48 plus 5/21 result in a terminating or repeating decimal?

It results in a repeating decimal (approximately 0.425595...) because the denominator contains prime factors other than 2 and 5.