Subtract 18/24 from 70/21
1st number: 3 7/21, 2nd number: 18/24
70/21 - 18/24 is 31/12.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 24 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 21 × 8 = 168,
70/21 = 70 × 8/21 × 8 = 560/168 - Likewise, for the 2nd fraction, since 24 × 7 = 168,
18/24 = 18 × 7/24 × 7 = 126/168 - Subtract the two like fractions:
560/168 - 126/168 = 560 - 126/168 = 434/168 - After reducing the fraction, the answer is 31/12
- In mixed form: 27/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/21-36/24 70/42-18/24 70/21-18/48 70/21-54/24 70/63-18/24 70/21-18/72 70/21-90/24