Subtract 4/10 from 40/21
1st number: 1 19/21, 2nd number: 4/10
40/21 - 4/10 is 158/105.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 10 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 10 × 21 = 210,
4/10 = 4 × 21/10 × 21 = 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: 80/21-4/10 40/21-8/10 40/42-4/10 40/21-4/20 40/21-12/10 40/63-4/10 40/21-4/30 40/21-20/10 40/21-4/50 40/21-28/10 40/21-4/70