Subtract 54/42 from 20/5
1st number: 4 0/5, 2nd number: 1 12/42
20/5 - 54/42 is 19/7.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 42 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 5 × 42 = 210,
20/5 = 20 × 42/5 × 42 = 840/210 - Likewise, for the 2nd fraction, since 42 × 5 = 210,
54/42 = 54 × 5/42 × 5 = 270/210 - Subtract the two like fractions:
840/210 - 270/210 = 840 - 270/210 = 570/210 - After reducing the fraction, the answer is 19/7
- In mixed form: 25/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/5-54/42 20/10-54/42 20/5-54/84 60/5-54/42 20/15-54/42 20/25-54/42 20/35-54/42