Subtract 42/10 from 90/72
1st number: 1 18/72, 2nd number: 4 2/10
90/72 - 42/10 is -59/20.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 10 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 72 × 5 = 360,
90/72 = 90 × 5/72 × 5 = 450/360 - Likewise, for the 2nd fraction, since 10 × 36 = 360,
42/10 = 42 × 36/10 × 36 = 1512/360 - Subtract the two like fractions:
450/360 - 1512/360 = 450 - 1512/360 = -1062/360 - After reducing the fraction, the answer is -59/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/72-84/10 90/72-42/20 90/72-42/30 90/72-42/50 90/72-42/70