Answers

Subtract 21/10 from 90/50

1^st number: 1 40/50, 2^nd number: 2 1/10

90/50 - 21/10 is -3/10.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 50 and 10 is 50
   
   Next, find the equivalent fraction of both fractional numbers with denominator 50
2. For the 1st fraction, since 50 × 1 = 50,
   90/50 = 90 × 1/50 × 1 = 90/50
3. Likewise, for the 2nd fraction, since 10 × 5 = 50,
   21/10 = 21 × 5/10 × 5 = 105/50
4. Subtract the two like fractions:
   90/50 - 105/50 = 90 - 105/50 = -15/50
5. After reducing the fraction, the answer is -3/10

MathStep (Works offline)

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

Related: ⁹⁰/₅₀-⁴²/₁₀ ⁹⁰/₅₀-²¹/₂₀ ⁹⁰/₅₀-⁶³/₁₀ ⁹⁰/₅₀-²¹/₃₀ ⁹⁰/₅₀-²¹/₅₀ ⁹⁰/₅₀-²¹/₇₀

Subtract Fractions Calculator