Subtract 7/70 from 81/20
1st number: 4 1/20, 2nd number: 7/70
81/20 - 7/70 is 79/20.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 70 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 20 × 7 = 140,
81/20 = 81 × 7/20 × 7 = 567/140 - Likewise, for the 2nd fraction, since 70 × 2 = 140,
7/70 = 7 × 2/70 × 2 = 14/140 - Subtract the two like fractions:
567/140 - 14/140 = 567 - 14/140 = 553/140 - After reducing the fraction, the answer is 79/20
- In mixed form: 319/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/20-14/70 81/40-7/70 81/20-21/70 81/60-7/70 81/20-35/70 81/20-49/70