Subtract 16/9 from 42/84
1st number: 42/84, 2nd number: 1 7/9
42/84 - 16/9 is -23/18.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 9 is 252
Next, find the equivalent fraction of both fractional numbers with denominator 252 - For the 1st fraction, since 84 × 3 = 252,
42/84 = 42 × 3/84 × 3 = 126/252 - Likewise, for the 2nd fraction, since 9 × 28 = 252,
16/9 = 16 × 28/9 × 28 = 448/252 - Subtract the two like fractions:
126/252 - 448/252 = 126 - 448/252 = -322/252 - After reducing the fraction, the answer is -23/18
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/84-32/9 42/84-16/18 42/84-48/9 42/84-16/27 42/84-80/9 42/84-16/45 42/84-16/63