Subtract 12/42 from 40/30
1st number: 1 10/30, 2nd number: 12/42
40/30 - 12/42 is 22/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 42 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 30 × 7 = 210,
40/30 = 40 × 7/30 × 7 = 280/210 - Likewise, for the 2nd fraction, since 42 × 5 = 210,
12/42 = 12 × 5/42 × 5 = 60/210 - Subtract the two like fractions:
280/210 - 60/210 = 280 - 60/210 = 220/210 - After reducing the fraction, the answer is 22/21
- In mixed form: 11/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/30-12/42 40/30-24/42 40/60-12/42 40/30-12/84 40/30-36/42 40/90-12/42 40/30-60/42 40/30-84/42