Subtract 42/20 from 16/9
1st number: 1 7/9, 2nd number: 2 2/20
16/9 - 42/20 is -29/90.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 20 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 9 × 20 = 180,
16/9 = 16 × 20/9 × 20 = 320/180 - Likewise, for the 2nd fraction, since 20 × 9 = 180,
42/20 = 42 × 9/20 × 9 = 378/180 - Subtract the two like fractions:
320/180 - 378/180 = 320 - 378/180 = -58/180 - After reducing the fraction, the answer is -29/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 32/9-42/20 16/9-84/20 16/18-42/20 16/9-42/40 48/9-42/20 16/27-42/20 16/9-42/60 80/9-42/20 16/45-42/20 16/63-42/20