What is 9/48 plus 12/21? (Answer: 85/112)

Exact Answer

==================================================
Problem: What is 9/48 plus 12/21?
Formula / Expression: 9/48 + 12/21
Final Answer: 85/112
==================================================

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 12/21 by 16 so both fractions share the common base 336.
Working: 9 × 7/48 × 7 = 63/336 and 12 × 16/21 × 16 = 192/336

Step 3: Add the Numerators
Now add the numerators (63 + 192 = 255) and keep the common denominator 336 unchanged.
Working: 63 + 192/336 = 255/336

Step 4: Simplify the Fraction to Lowest Terms
Find the Greatest Common Divisor (GCD) of 255 and 336, which is 3. Divide both the numerator and denominator by 3.
Working: 255 ÷ 3/336 ÷ 3 = 85/112

Step 5: Decimal & Percentage Representation
Dividing the numerator 85 by denominator 112 produces a repeating decimal (approximately 0.758929, or 75.8929%).
Working: 85 ÷ 112 = 0.758929 (75.8929%)

Key Values:
- Simplified Fraction: 85/112
- Mixed Number Form: 85/112
- Decimal Value: 0.758929
- Percentage: 75.8929%

--------------------------------------------------
Solved with FractionsCalc:
https://fractionscalc.com/what-is-9-48-plus-12-21/
==================================================

9/48 + 12/21 = 85/112

Simplified Fraction

85/112

Mixed Number

Proper (85/112)

Decimal Value

0.758929

Percentage

75.8929%

Reduce / Convert Fraction:

Convert Fraction:

Enter Decimal Number:

Enter Percentage: %

What is % of

From Value: To Value:

Simplify Ratio: :

Switch to Proportion / Missing X Solver (A/B = C/D) →

Enter 3 known numbers and leave 1 empty (or type x) to solve:

← Switch to Ratio Simplifier (A:B)

Provide any 2 values below to calculate the remaining:

Price before discount

Discount

Price after discount

You saved

+ Add Sales Tax & Extra Coupon (Optional)

Sales Tax: % Extra Off: %

Provide any 2 values below to calculate the remaining:

Cost

Markup

REVENUE

Gross Profit

Profit Margin

Bill Subtotal

Tip Percentage

Split (People)

👥

Quick Tip:

Total Bill

Split Between

👥

Tip % (Optional)

Include Tip:

Total Price

Quantity

Unit of Measure

← Discount & Sales Tax • Ratio Simplifier (A:B) →

First Number: Second Number:

Find All Factors of:

Dividend: ÷ Divisor:

Number to Round: To Nearest:

Method: Standard (5+ ↑) Always Up (Ceil) Always Down (Floor)

Presets:

√ Square Root of: OR Power (x^y): ^{^}

x² + x + = 0

Number (n! & log):

Circle Radius (r):

Side a: Side b:

Angle (Degrees): °

Numbers (comma separated):

Total Items (n): Choose (r):

Decimal Number:

Number (1–3999):

Step-by-Step Solution: 9/48 + 12/21

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 12/21 by 16 so both fractions share the common base 336.

9 × 7/48 × 7 = 63/336 and 12 × 16/21 × 16 = 192/336

Step 3

Add the Numerators

Now add the numerators (63 + 192 = 255) and keep the common denominator 336 unchanged.

63 + 192/336 = 255/336

Step 4

Simplify the Fraction to Lowest Terms

Find the Greatest Common Divisor (GCD) of 255 and 336, which is 3. Divide both the numerator and denominator by 3.

255 ÷ 3/336 ÷ 3 = 85/112

Step 5

Decimal & Percentage Representation

Dividing the numerator 85 by denominator 112 produces a repeating decimal (approximately 0.758929, or 75.8929%).

85 ÷ 112 = 0.758929 (75.8929%)

Visual Representation

The diagram below illustrates 9/48 plus 12/21 visually:

Summary & Alternative Representations

Property / Format	Value
Lowest Terms Fraction	`85/112`
Mixed Number Form	`85/112`
Decimal Form	`0.758929`
Percentage	`75.8929%`

Was this solution helpful?

Help us improve our free step-by-step tools

Frequently Asked Questions

What is 9/48 plus 12/21 as a fraction?

9/48 + 12/21 in simplest fraction form is 85/112.

What is 9/48 plus 12/21 as a decimal?

9/48 + 12/21 converted to a decimal is 0.758929.

What is 9/48 plus 12/21 as a percentage?

9/48 + 12/21 expressed as a percentage is 75.8929%.

Does 9/48 plus 12/21 result in a terminating or repeating decimal?

It results in a repeating decimal (approximately 0.758929...) because the denominator contains prime factors other than 2 and 5.