Subtract 28/70 from 40/21
1st number: 1 19/21, 2nd number: 28/70
40/21 - 28/70 is 158/105.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 70 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 21 × 10 = 210,
40/21 = 40 × 10/21 × 10 = 400/210 - Likewise, for the 2nd fraction, since 70 × 3 = 210,
28/70 = 28 × 3/70 × 3 = 84/210 - Subtract the two like fractions:
400/210 - 84/210 = 400 - 84/210 = 316/210 - After reducing the fraction, the answer is 158/105
- In mixed form: 153/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/21-28/70 40/21-56/70 40/42-28/70 40/21-84/70 40/63-28/70