What is 18/48 plus 10/21? (Answer: 143/168)

Exact Answer

==================================================
Problem: What is 18/48 plus 10/21?
Formula / Expression: 18/48 + 10/21
Final Answer: 143/168
==================================================

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 18/48 by 7, and multiply the numerator and denominator of 10/21 by 16 so both fractions share the common base 336.
Working: 18 × 7/48 × 7 = 126/336 and 10 × 16/21 × 16 = 160/336

Step 3: Add the Numerators
Now add the numerators (126 + 160 = 286) and keep the common denominator 336 unchanged.
Working: 126 + 160/336 = 286/336

Step 4: Simplify the Fraction to Lowest Terms
Find the Greatest Common Divisor (GCD) of 286 and 336, which is 2. Divide both the numerator and denominator by 2.
Working: 286 ÷ 2/336 ÷ 2 = 143/168

Step 5: Decimal & Percentage Representation
Dividing the numerator 143 by denominator 168 produces a repeating decimal (approximately 0.85119, or 85.119%).
Working: 143 ÷ 168 = 0.85119 (85.119%)

Key Values:
- Simplified Fraction: 143/168
- Mixed Number Form: 143/168
- Decimal Value: 0.85119
- Percentage: 85.119%

--------------------------------------------------
Solved with FractionsCalc:
https://fractionscalc.com/what-is-18-48-plus-10-21/
==================================================

18/48 + 10/21 = 143/168

Simplified Fraction

143/168

Mixed Number

Proper (143/168)

Decimal Value

0.85119

Percentage

85.119%

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: 18/48 + 10/21

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 18/48 by 7, and multiply the numerator and denominator of 10/21 by 16 so both fractions share the common base 336.

18 × 7/48 × 7 = 126/336 and 10 × 16/21 × 16 = 160/336

Step 3

Add the Numerators

Now add the numerators (126 + 160 = 286) and keep the common denominator 336 unchanged.

126 + 160/336 = 286/336

Step 4

Simplify the Fraction to Lowest Terms

Find the Greatest Common Divisor (GCD) of 286 and 336, which is 2. Divide both the numerator and denominator by 2.

286 ÷ 2/336 ÷ 2 = 143/168

Step 5

Decimal & Percentage Representation

Dividing the numerator 143 by denominator 168 produces a repeating decimal (approximately 0.85119, or 85.119%).

143 ÷ 168 = 0.85119 (85.119%)

Visual Representation

The diagram below illustrates 18/48 plus 10/21 visually:

Summary & Alternative Representations

Property / Format	Value
Lowest Terms Fraction	`143/168`
Mixed Number Form	`143/168`
Decimal Form	`0.85119`
Percentage	`85.119%`

Was this solution helpful?

Help us improve our free step-by-step tools

Frequently Asked Questions

What is 18/48 plus 10/21 as a fraction?

18/48 + 10/21 in simplest fraction form is 143/168.

What is 18/48 plus 10/21 as a decimal?

18/48 + 10/21 converted to a decimal is 0.85119.

What is 18/48 plus 10/21 as a percentage?

18/48 + 10/21 expressed as a percentage is 85.119%.

Does 18/48 plus 10/21 result in a terminating or repeating decimal?

It results in a repeating decimal (approximately 0.85119...) because the denominator contains prime factors other than 2 and 5.