Subtract 40/70 from 3/45
3/45 - 40/70 is -53/105.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 70 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 45 × 14 = 630,
3/45 = 3 × 14/45 × 14 = 42/630 - Likewise, for the 2nd fraction, since 70 × 9 = 630,
40/70 = 40 × 9/70 × 9 = 360/630 - Subtract the two like fractions:
42/630 - 360/630 = 42 - 360/630 = -318/630 - After reducing the fraction, the answer is -53/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/45-40/70 3/45-80/70 3/90-40/70 9/45-40/70 15/45-40/70 21/45-40/70