Subtract 50/40 from 28/42
1st number: 28/42, 2nd number: 1 10/40
28/42 - 50/40 is -7/12.
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,
28/42 = 28 × 20/42 × 20 = 560/840 - Likewise, for the 2nd fraction, since 40 × 21 = 840,
50/40 = 50 × 21/40 × 21 = 1050/840 - Subtract the two like fractions:
560/840 - 1050/840 = 560 - 1050/840 = -490/840 - After reducing the fraction, the answer is -7/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/42-50/40 28/84-50/40 28/42-50/80 84/42-50/40