Subtract 40/21 from 1/70
1st number: 1/70, 2nd number: 1 19/21
1/70 - 40/21 is -397/210.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 21 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 70 × 3 = 210,
1/70 = 1 × 3/70 × 3 = 3/210 - Likewise, for the 2nd fraction, since 21 × 10 = 210,
40/21 = 40 × 10/21 × 10 = 400/210 - Subtract the two like fractions:
3/210 - 400/210 = 3 - 400/210 = -397/210
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/70-40/21 1/70-80/21 1/70-40/42 3/70-40/21 1/70-40/63 5/70-40/21 7/70-40/21