Subtract 70/40 from 4/21
1st number: 4/21, 2nd number: 1 30/40
4/21 - 70/40 is -131/84.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 40 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 21 × 40 = 840,
4/21 = 4 × 40/21 × 40 = 160/840 - Likewise, for the 2nd fraction, since 40 × 21 = 840,
70/40 = 70 × 21/40 × 21 = 1470/840 - Subtract the two like fractions:
160/840 - 1470/840 = 160 - 1470/840 = -1310/840 - After reducing the fraction, the answer is -131/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/21-70/40 4/42-70/40 4/21-70/80 12/21-70/40 4/63-70/40 20/21-70/40 28/21-70/40