Subtract 20/42 from 40/8
1st number: 5 0/8, 2nd number: 20/42
40/8 - 20/42 is 95/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 42 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 8 × 21 = 168,
40/8 = 40 × 21/8 × 21 = 840/168 - Likewise, for the 2nd fraction, since 42 × 4 = 168,
20/42 = 20 × 4/42 × 4 = 80/168 - Subtract the two like fractions:
840/168 - 80/168 = 840 - 80/168 = 760/168 - After reducing the fraction, the answer is 95/21
- In mixed form: 411/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/8-20/42 40/8-40/42 40/16-20/42 40/8-20/84 40/8-60/42 40/24-20/42 40/56-20/42