Subtract 10/42 from 84/21
1st number: 4 0/21, 2nd number: 10/42
84/21 - 10/42 is 79/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 42 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 21 × 2 = 42,
84/21 = 84 × 2/21 × 2 = 168/42 - Likewise, for the 2nd fraction, since 42 × 1 = 42,
10/42 = 10 × 1/42 × 1 = 10/42 - Subtract the two like fractions:
168/42 - 10/42 = 168 - 10/42 = 158/42 - After reducing the fraction, the answer is 79/21
- In mixed form: 316/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/21-20/42 84/42-10/42 84/21-10/84 84/21-30/42 84/63-10/42 84/21-50/42 84/21-70/42