Subtract 1/40 from 45/90
45/90 - 1/40 is 19/40.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 40 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 90 × 4 = 360,
45/90 = 45 × 4/90 × 4 = 180/360 - Likewise, for the 2nd fraction, since 40 × 9 = 360,
1/40 = 1 × 9/40 × 9 = 9/360 - Subtract the two like fractions:
180/360 - 9/360 = 180 - 9/360 = 171/360 - After reducing the fraction, the answer is 19/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 45/90-2/40 45/90-1/80 45/90-3/40 45/90-5/40 45/90-7/40