Add 40/14 and 21/90
1st number: 2 12/14, 2nd number: 21/90
40/14 + 21/90 is 649/210.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 14 and 90 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 14 × 45 = 630,
40/14 = 40 × 45/14 × 45 = 1800/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
21/90 = 21 × 7/90 × 7 = 147/630 - Add the two like fractions:
1800/630 + 147/630 = 1800 + 147/630 = 1947/630 - 1947/630 simplified gives 649/210
- So, 40/14 + 21/90 = 649/210
In mixed form: 319/210
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/14+21/90 40/14+42/90 40/28+21/90 40/14+63/90 40/42+21/90 40/70+21/90 40/98+21/90