Subtract 45/4 from 90/42
1st number: 2 6/42, 2nd number: 11 1/4
90/42 - 45/4 is -255/28.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 4 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 42 × 2 = 84,
90/42 = 90 × 2/42 × 2 = 180/84 - Likewise, for the 2nd fraction, since 4 × 21 = 84,
45/4 = 45 × 21/4 × 21 = 945/84 - Subtract the two like fractions:
180/84 - 945/84 = 180 - 945/84 = -765/84 - After reducing the fraction, the answer is -255/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/42-90/4 90/84-45/4 90/42-45/8 90/42-45/12 90/42-45/20 90/42-45/28