Subtract 21/10 from 84/2
1st number: 42 0/2, 2nd number: 2 1/10
84/2 - 21/10 is 399/10.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 2 and 10 is 10
Next, find the equivalent fraction of both fractional numbers with denominator 10 - For the 1st fraction, since 2 × 5 = 10,
84/2 = 84 × 5/2 × 5 = 420/10 - Likewise, for the 2nd fraction, since 10 × 1 = 10,
21/10 = 21 × 1/10 × 1 = 21/10 - Subtract the two like fractions:
420/10 - 21/10 = 420 - 21/10 = 399/10 - In mixed form: 399/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/2-42/10 84/4-21/10 84/2-21/20 84/2-63/10 84/6-21/10 84/2-21/30 84/10-21/10 84/2-21/50 84/14-21/10 84/2-21/70