Add 21/14 and 40/90
1st number: 1 7/14, 2nd number: 40/90
21/14 + 40/90 is 35/18.
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,
21/14 = 21 × 45/14 × 45 = 945/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
40/90 = 40 × 7/90 × 7 = 280/630 - Add the two like fractions:
945/630 + 280/630 = 945 + 280/630 = 1225/630 - 1225/630 simplified gives 35/18
- So, 21/14 + 40/90 = 35/18
In mixed form: 117/18
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/14+40/90 21/14+80/90 21/28+40/90 63/14+40/90 21/42+40/90 21/70+40/90 21/98+40/90