Subtract 1/40 from 50/42
1st number: 1 8/42, 2nd number: 1/40
50/42 - 1/40 is 979/840.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 40 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 42 × 20 = 840,
50/42 = 50 × 20/42 × 20 = 1000/840 - Likewise, for the 2nd fraction, since 40 × 21 = 840,
1/40 = 1 × 21/40 × 21 = 21/840 - Subtract the two like fractions:
1000/840 - 21/840 = 1000 - 21/840 = 979/840 - In mixed form: 1139/840
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 50/42-2/40 50/84-1/40 50/42-1/80 50/42-3/40 50/42-5/40 50/42-7/40