Subtract 8/42 from 40/10
1st number: 4 0/10, 2nd number: 8/42
40/10 - 8/42 is 80/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 10 and 42 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 10 × 21 = 210,
40/10 = 40 × 21/10 × 21 = 840/210 - Likewise, for the 2nd fraction, since 42 × 5 = 210,
8/42 = 8 × 5/42 × 5 = 40/210 - Subtract the two like fractions:
840/210 - 40/210 = 840 - 40/210 = 800/210 - After reducing the fraction, the answer is 80/21
- In mixed form: 317/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/10-8/42 40/10-16/42 40/20-8/42 40/10-8/84 40/10-24/42 40/30-8/42 40/10-40/42 40/50-8/42 40/10-56/42 40/70-8/42