Answers

Subtract 7/70 from 90/72

1^st number: 1 18/72, 2^nd number: 7/70

90/72 - 7/70 is 23/20.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 72 and 70 is 2520
   
   Next, find the equivalent fraction of both fractional numbers with denominator 2520
2. For the 1st fraction, since 72 × 35 = 2520,
   90/72 = 90 × 35/72 × 35 = 3150/2520
3. Likewise, for the 2nd fraction, since 70 × 36 = 2520,
   7/70 = 7 × 36/70 × 36 = 252/2520
4. Subtract the two like fractions:
   3150/2520 - 252/2520 = 3150 - 252/2520 = 2898/2520
5. After reducing the fraction, the answer is 23/20
6. In mixed form: 13/20

MathStep (Works offline)

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

Related: ⁹⁰/₇₂-¹⁴/₇₀ ⁹⁰/₇₂-²¹/₇₀ ⁹⁰/₇₂-³⁵/₇₀ ⁹⁰/₇₂-⁴⁹/₇₀

Subtract Fractions Calculator