Subtract 12/90 from 42/48
42/48 - 12/90 is 89/120.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 48 and 90 is 720
Next, find the equivalent fraction of both fractional numbers with denominator 720 - For the 1st fraction, since 48 × 15 = 720,
42/48 = 42 × 15/48 × 15 = 630/720 - Likewise, for the 2nd fraction, since 90 × 8 = 720,
12/90 = 12 × 8/90 × 8 = 96/720 - Subtract the two like fractions:
630/720 - 96/720 = 630 - 96/720 = 534/720 - After reducing the fraction, the answer is 89/120
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/48-12/90 42/48-24/90 42/96-12/90 42/48-36/90 42/48-60/90 42/48-84/90