Subtract 40/5 from 42/20
1st number: 2 2/20, 2nd number: 8 0/5
42/20 - 40/5 is -59/10.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 5 is 20
Next, find the equivalent fraction of both fractional numbers with denominator 20 - For the 1st fraction, since 20 × 1 = 20,
42/20 = 42 × 1/20 × 1 = 42/20 - Likewise, for the 2nd fraction, since 5 × 4 = 20,
40/5 = 40 × 4/5 × 4 = 160/20 - Subtract the two like fractions:
42/20 - 160/20 = 42 - 160/20 = -118/20 - After reducing the fraction, the answer is -59/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/20-40/5 42/20-80/5 42/40-40/5 42/20-40/10 42/60-40/5 42/20-40/15 42/20-40/25 42/20-40/35