What is 3/24 plus 2/5? (Answer: 21/40)

Exact Answer

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Problem: What is 3/24 plus 2/5?
Formula / Expression: 3/24 + 2/5
Final Answer: 21/40
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Step-by-Step Solution:

Step 1: Find the Least Common Denominator (LCD)
The denominators 24 and 5 are coprime (they share no common factors other than 1). Therefore, their Least Common Denominator (LCD) is simply their direct product: 24 × 5 = 120.
Working: LCD(24, 5) = 120

Step 2: Convert to Equivalent Fractions with Common Denominator 120
Multiply the numerator and denominator of 3/24 by 5, and multiply the numerator and denominator of 2/5 by 24 so both fractions share the common base 120.
Working: 3 × 5/24 × 5 = 15/120 and 2 × 24/5 × 24 = 48/120

Step 3: Add the Numerators
Now add the numerators (15 + 48 = 63) and keep the common denominator 120 unchanged.
Working: 15 + 48/120 = 63/120

Step 4: Simplify the Fraction to Lowest Terms
Find the Greatest Common Divisor (GCD) of 63 and 120, which is 3. Divide both the numerator and denominator by 3.
Working: 63 ÷ 3/120 ÷ 3 = 21/40

Step 5: Decimal & Percentage Representation
Dividing the numerator 21 by denominator 40 yields an exact terminating decimal of 0.525 (or 52.5%).
Working: 21 ÷ 40 = 0.525 (52.5%)

Key Values:
- Simplified Fraction: 21/40
- Mixed Number Form: 21/40
- Decimal Value: 0.525
- Percentage: 52.5%

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Solved with FractionsCalc:
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3/24 + 2/5 = 21/40

Simplified Fraction

21/40

Mixed Number

Proper (21/40)

Decimal Value

0.525

Percentage

52.5%

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Step-by-Step Solution: 3/24 + 2/5

Step 1

Find the Least Common Denominator (LCD)

The denominators 24 and 5 are coprime (they share no common factors other than 1). Therefore, their Least Common Denominator (LCD) is simply their direct product: 24 × 5 = 120.

LCD(24, 5) = 120

Step 2

Convert to Equivalent Fractions with Common Denominator 120

Multiply the numerator and denominator of 3/24 by 5, and multiply the numerator and denominator of 2/5 by 24 so both fractions share the common base 120.

3 × 5/24 × 5 = 15/120 and 2 × 24/5 × 24 = 48/120

Step 3

Add the Numerators

Now add the numerators (15 + 48 = 63) and keep the common denominator 120 unchanged.

15 + 48/120 = 63/120

Step 4

Simplify the Fraction to Lowest Terms

Find the Greatest Common Divisor (GCD) of 63 and 120, which is 3. Divide both the numerator and denominator by 3.

63 ÷ 3/120 ÷ 3 = 21/40

Step 5

Decimal & Percentage Representation

Dividing the numerator 21 by denominator 40 yields an exact terminating decimal of 0.525 (or 52.5%).

21 ÷ 40 = 0.525 (52.5%)

Visual Representation

The diagram below illustrates 3/24 plus 2/5 visually:

Summary & Alternative Representations

Property / Format	Value
Lowest Terms Fraction	`21/40`
Mixed Number Form	`21/40`
Decimal Form	`0.525`
Percentage	`52.5%`

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Frequently Asked Questions

What is 3/24 plus 2/5 as a fraction?

3/24 + 2/5 in simplest fraction form is 21/40.

What is 3/24 plus 2/5 as a decimal?

3/24 + 2/5 converted to a decimal is 0.525.

What is 3/24 plus 2/5 as a percentage?

3/24 + 2/5 expressed as a percentage is 52.5%.

Does 3/24 plus 2/5 result in a terminating or repeating decimal?

It results in an exact terminating decimal (0.525) because the denominator in simplest terms contains only prime factors 2 and/or 5.