Subtract 42/24 from 90/70
1st number: 1 20/70, 2nd number: 1 18/24
90/70 - 42/24 is -13/28.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 24 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 70 × 12 = 840,
90/70 = 90 × 12/70 × 12 = 1080/840 - Likewise, for the 2nd fraction, since 24 × 35 = 840,
42/24 = 42 × 35/24 × 35 = 1470/840 - Subtract the two like fractions:
1080/840 - 1470/840 = 1080 - 1470/840 = -390/840 - After reducing the fraction, the answer is -13/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/70-84/24 90/70-42/48 90/70-42/72