Subtract 45/10 from 42/20
1st number: 2 2/20, 2nd number: 4 5/10
42/20 - 45/10 is -12/5.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 10 is 20
Next, find the equivalent fraction of both fractional numbers with denominator 20 - For the 1st fraction, since 20 × 1 = 20,
42/20 = 42 × 1/20 × 1 = 42/20 - Likewise, for the 2nd fraction, since 10 × 2 = 20,
45/10 = 45 × 2/10 × 2 = 90/20 - Subtract the two like fractions:
42/20 - 90/20 = 42 - 90/20 = -48/20 - After reducing the fraction, the answer is -12/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/20-45/10 42/20-90/10 42/40-45/10 42/20-45/20 42/60-45/10 42/20-45/30 42/20-45/50 42/20-45/70