Answers

Subtract 45/15 from 42/2

1^st number: 21 0/2, 2^nd number: 3 0/15

42/2 - 45/15 is 18/1.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 2 and 15 is 30
   
   Next, find the equivalent fraction of both fractional numbers with denominator 30
2. For the 1st fraction, since 2 × 15 = 30,
   42/2 = 42 × 15/2 × 15 = 630/30
3. Likewise, for the 2nd fraction, since 15 × 2 = 30,
   45/15 = 45 × 2/15 × 2 = 90/30
4. Subtract the two like fractions:
   630/30 - 90/30 = 630 - 90/30 = 540/30
5. After reducing the fraction, the answer is 18/1

MathStep (Works offline)

Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad

Related: ⁸⁴/₂-⁴⁵/₁₅ ⁴²/₂-⁹⁰/₁₅ ⁴²/₄-⁴⁵/₁₅ ⁴²/₂-⁴⁵/₃₀ ⁴²/₆-⁴⁵/₁₅ ⁴²/₁₀-⁴⁵/₁₅ ⁴²/₂-⁴⁵/₇₅ ⁴²/₁₄-⁴⁵/₁₅

Subtract Fractions Calculator