Subtract 21/70 from 42/48
42/48 - 21/70 is 23/40.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 48 and 70 is 1680
Next, find the equivalent fraction of both fractional numbers with denominator 1680 - For the 1st fraction, since 48 × 35 = 1680,
42/48 = 42 × 35/48 × 35 = 1470/1680 - Likewise, for the 2nd fraction, since 70 × 24 = 1680,
21/70 = 21 × 24/70 × 24 = 504/1680 - Subtract the two like fractions:
1470/1680 - 504/1680 = 1470 - 504/1680 = 966/1680 - After reducing the fraction, the answer is 23/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/48-21/70 42/48-42/70 42/96-21/70 42/48-63/70