Subtract 1/42 from 2/45
2/45 - 1/42 is 13/630.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 42 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 45 × 14 = 630,
2/45 = 2 × 14/45 × 14 = 28/630 - Likewise, for the 2nd fraction, since 42 × 15 = 630,
1/42 = 1 × 15/42 × 15 = 15/630 - Subtract the two like fractions:
28/630 - 15/630 = 28 - 15/630 = 13/630
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 4/45-1/42 2/45-2/42 2/90-1/42 2/45-1/84 6/45-1/42 2/45-3/42 10/45-1/42 2/45-5/42 14/45-1/42 2/45-7/42