Subtract 16/90 from 12/42
12/42 - 16/90 is 34/315.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 90 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 42 × 15 = 630,
12/42 = 12 × 15/42 × 15 = 180/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
16/90 = 16 × 7/90 × 7 = 112/630 - Subtract the two like fractions:
180/630 - 112/630 = 180 - 112/630 = 68/630 - After reducing the fraction, the answer is 34/315
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/42-16/90 12/42-32/90 12/84-16/90 36/42-16/90 12/42-48/90 60/42-16/90 12/42-80/90 84/42-16/90