Add 14/21 and 40/90
14/21 + 40/90 is 10/9.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 90 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 21 × 30 = 630,
14/21 = 14 × 30/21 × 30 = 420/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
40/90 = 40 × 7/90 × 7 = 280/630 - Add the two like fractions:
420/630 + 280/630 = 420 + 280/630 = 700/630 - 700/630 simplified gives 10/9
- So, 14/21 + 40/90 = 10/9
In mixed form: 11/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 28/21+40/90 14/21+80/90 14/42+40/90 42/21+40/90 14/63+40/90 70/21+40/90 98/21+40/90