Subtract 45/70 from 21/48
21/48 - 45/70 is -23/112.
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,
21/48 = 21 × 35/48 × 35 = 735/1680 - Likewise, for the 2nd fraction, since 70 × 24 = 1680,
45/70 = 45 × 24/70 × 24 = 1080/1680 - Subtract the two like fractions:
735/1680 - 1080/1680 = 735 - 1080/1680 = -345/1680 - After reducing the fraction, the answer is -23/112
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/48-45/70 21/48-90/70 21/96-45/70 63/48-45/70