Subtract 21/10 from 4/20
1st number: 4/20, 2nd number: 2 1/10
4/20 - 21/10 is -19/10.
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,
4/20 = 4 × 1/20 × 1 = 4/20 - Likewise, for the 2nd fraction, since 10 × 2 = 20,
21/10 = 21 × 2/10 × 2 = 42/20 - Subtract the two like fractions:
4/20 - 42/20 = 4 - 42/20 = -38/20 - After reducing the fraction, the answer is -19/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/20-21/10 4/20-42/10 4/40-21/10 4/20-21/20 12/20-21/10 4/20-63/10 4/60-21/10 4/20-21/30 4/20-21/50 28/20-21/10 4/20-21/70