Subtract 9/10 from 42/75
42/75 - 9/10 is -17/50.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 75 and 10 is 150
Next, find the equivalent fraction of both fractional numbers with denominator 150 - For the 1st fraction, since 75 × 2 = 150,
42/75 = 42 × 2/75 × 2 = 84/150 - Likewise, for the 2nd fraction, since 10 × 15 = 150,
9/10 = 9 × 15/10 × 15 = 135/150 - Subtract the two like fractions:
84/150 - 135/150 = 84 - 135/150 = -51/150 - After reducing the fraction, the answer is -17/50
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/75-9/10 42/75-18/10 42/75-9/20 42/75-27/10 42/75-9/30 42/75-45/10 42/75-9/50 42/75-63/10 42/75-9/70