Subtract 50/40 from 7/42
1st number: 7/42, 2nd number: 1 10/40
7/42 - 50/40 is -13/12.
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,
7/42 = 7 × 20/42 × 20 = 140/840 - Likewise, for the 2nd fraction, since 40 × 21 = 840,
50/40 = 50 × 21/40 × 21 = 1050/840 - Subtract the two like fractions:
140/840 - 1050/840 = 140 - 1050/840 = -910/840 - After reducing the fraction, the answer is -13/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/42-50/40 7/84-50/40 7/42-50/80 21/42-50/40 35/42-50/40 49/42-50/40