Subtract 12/10 from 45/42
1st number: 1 3/42, 2nd number: 1 2/10
45/42 - 12/10 is -9/70.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 10 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 42 × 5 = 210,
45/42 = 45 × 5/42 × 5 = 225/210 - Likewise, for the 2nd fraction, since 10 × 21 = 210,
12/10 = 12 × 21/10 × 21 = 252/210 - Subtract the two like fractions:
225/210 - 252/210 = 225 - 252/210 = -27/210 - After reducing the fraction, the answer is -9/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/42-12/10 45/42-24/10 45/84-12/10 45/42-12/20 45/42-36/10 45/42-12/30 45/42-60/10 45/42-12/50 45/42-84/10 45/42-12/70