What is 2/9 plus 4/10? (Answer: 28/45)

Exact Answer

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Problem: What is 2/9 plus 4/10?
Formula / Expression: 2/9 + 4/10
Final Answer: 28/45
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Step-by-Step Solution:

Step 1: Find the Least Common Denominator (LCD)
The denominators 9 and 10 are coprime (they share no common factors other than 1). Therefore, their Least Common Denominator (LCD) is simply their direct product: 9 × 10 = 90.
Working: LCD(9, 10) = 90

Step 2: Convert to Equivalent Fractions with Common Denominator 90
Multiply the numerator and denominator of 2/9 by 10, and multiply the numerator and denominator of 4/10 by 9 so both fractions share the common base 90.
Working: 2 × 10/9 × 10 = 20/90 and 4 × 9/10 × 9 = 36/90

Step 3: Add the Numerators
Now add the numerators (20 + 36 = 56) and keep the common denominator 90 unchanged.
Working: 20 + 36/90 = 56/90

Step 4: Simplify the Fraction to Lowest Terms
Find the Greatest Common Divisor (GCD) of 56 and 90, which is 2. Divide both the numerator and denominator by 2.
Working: 56 ÷ 2/90 ÷ 2 = 28/45

Step 5: Decimal & Percentage Representation
Dividing the numerator 28 by denominator 45 produces a repeating decimal (approximately 0.622222, or 62.2222%).
Working: 28 ÷ 45 = 0.622222 (62.2222%)

Key Values:
- Simplified Fraction: 28/45
- Mixed Number Form: 28/45
- Decimal Value: 0.622222
- Percentage: 62.2222%

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Solved with FractionsCalc:
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2/9 + 4/10 = 28/45

Simplified Fraction

28/45

Mixed Number

Proper (28/45)

Decimal Value

0.622222

Percentage

62.2222%

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Step-by-Step Solution: 2/9 + 4/10

Step 1

Find the Least Common Denominator (LCD)

The denominators 9 and 10 are coprime (they share no common factors other than 1). Therefore, their Least Common Denominator (LCD) is simply their direct product: 9 × 10 = 90.

LCD(9, 10) = 90

Step 2

Convert to Equivalent Fractions with Common Denominator 90

Multiply the numerator and denominator of 2/9 by 10, and multiply the numerator and denominator of 4/10 by 9 so both fractions share the common base 90.

2 × 10/9 × 10 = 20/90 and 4 × 9/10 × 9 = 36/90

Step 3

Add the Numerators

Now add the numerators (20 + 36 = 56) and keep the common denominator 90 unchanged.

20 + 36/90 = 56/90

Step 4

Simplify the Fraction to Lowest Terms

Find the Greatest Common Divisor (GCD) of 56 and 90, which is 2. Divide both the numerator and denominator by 2.

56 ÷ 2/90 ÷ 2 = 28/45

Step 5

Decimal & Percentage Representation

Dividing the numerator 28 by denominator 45 produces a repeating decimal (approximately 0.622222, or 62.2222%).

28 ÷ 45 = 0.622222 (62.2222%)

Visual Representation

The diagram below illustrates 2/9 plus 4/10 visually:

Summary & Alternative Representations

Property / Format	Value
Lowest Terms Fraction	`28/45`
Mixed Number Form	`28/45`
Decimal Form	`0.622222`
Percentage	`62.2222%`

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Frequently Asked Questions

What is 2/9 plus 4/10 as a fraction?

2/9 + 4/10 in simplest fraction form is 28/45.

What is 2/9 plus 4/10 as a decimal?

2/9 + 4/10 converted to a decimal is 0.622222.

What is 2/9 plus 4/10 as a percentage?

2/9 + 4/10 expressed as a percentage is 62.2222%.

Does 2/9 plus 4/10 result in a terminating or repeating decimal?

It results in a repeating decimal (approximately 0.622222...) because the denominator contains prime factors other than 2 and 5.