Subtract 9/10 from 42/45
42/45 - 9/10 is 1/30.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 10 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 45 × 2 = 90,
42/45 = 42 × 2/45 × 2 = 84/90 - Likewise, for the 2nd fraction, since 10 × 9 = 90,
9/10 = 9 × 9/10 × 9 = 81/90 - Subtract the two like fractions:
84/90 - 81/90 = 84 - 81/90 = 3/90 - After reducing the fraction, the answer is 1/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/45-9/10 42/45-18/10 42/90-9/10 42/45-9/20 42/45-27/10 42/45-9/30 42/45-45/10 42/45-9/50 42/45-63/10 42/45-9/70