Subtract 30/21 from 1/2
1st number: 1/2, 2nd number: 1 9/21
12 - 3021 is -1314.
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,
12 = 1 × 212 × 21 = 2142 - Likewise, for the 2nd fraction, since 21 × 2 = 42,
3021 = 30 × 221 × 2 = 6042 - Subtract the two like fractions:
2142 - 6042 = 21 - 6042 = -3942 - After reducing the fraction, the answer is -1314
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 1/2-60/21 1/4-30/21 1/2-30/42 3/2-30/21 1/2-90/21 1/6-30/21 1/2-30/63 5/2-30/21 1/10-30/21 7/2-30/21 1/14-30/21