Subtract 3/21 from 30/2
1st number: 15 0/2, 2nd number: 3/21
30/2 - 3/21 is 104/7.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 2 and 21 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 2 × 21 = 42,
30/2 = 30 × 21/2 × 21 = 630/42 - Likewise, for the 2nd fraction, since 21 × 2 = 42,
3/21 = 3 × 2/21 × 2 = 6/42 - Subtract the two like fractions:
630/42 - 6/42 = 630 - 6/42 = 624/42 - After reducing the fraction, the answer is 104/7
- In mixed form: 146/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/2-3/21 30/2-6/21 30/4-3/21 30/2-3/42 90/2-3/21 30/2-9/21 30/6-3/21 30/2-3/63 30/2-15/21 30/10-3/21 30/14-3/21