Subtract 28/70 from 81/4
1st number: 20 1/4, 2nd number: 28/70
81/4 - 28/70 is 397/20.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 70 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 4 × 35 = 140,
81/4 = 81 × 35/4 × 35 = 2835/140 - Likewise, for the 2nd fraction, since 70 × 2 = 140,
28/70 = 28 × 2/70 × 2 = 56/140 - Subtract the two like fractions:
2835/140 - 56/140 = 2835 - 56/140 = 2779/140 - After reducing the fraction, the answer is 397/20
- In mixed form: 1917/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/4-56/70 81/8-28/70 81/4-84/70 81/12-28/70 81/20-28/70 81/28-28/70