Subtract 70/72 from 1/20
1/20 - 70/72 is -83/90.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 72 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 20 × 18 = 360,
1/20 = 1 × 18/20 × 18 = 18/360 - Likewise, for the 2nd fraction, since 72 × 5 = 360,
70/72 = 70 × 5/72 × 5 = 350/360 - Subtract the two like fractions:
18/360 - 350/360 = 18 - 350/360 = -332/360 - After reducing the fraction, the answer is -83/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/20-70/72 1/40-70/72 3/20-70/72 1/60-70/72 5/20-70/72 7/20-70/72