Subtract 70/54 from 4/21
1st number: 4/21, 2nd number: 1 16/54
4/21 - 70/54 is -209/189.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 54 is 378
Next, find the equivalent fraction of both fractional numbers with denominator 378 - For the 1st fraction, since 21 × 18 = 378,
4/21 = 4 × 18/21 × 18 = 72/378 - Likewise, for the 2nd fraction, since 54 × 7 = 378,
70/54 = 70 × 7/54 × 7 = 490/378 - Subtract the two like fractions:
72/378 - 490/378 = 72 - 490/378 = -418/378 - After reducing the fraction, the answer is -209/189
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/21-70/54 4/42-70/54 12/21-70/54 4/63-70/54 20/21-70/54 28/21-70/54