Add 90/21 and 6/40
1st number: 4 6/21, 2nd number: 6/40
90/21 + 6/40 is 621/140.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 40 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 21 × 40 = 840,
90/21 = 90 × 40/21 × 40 = 3600/840 - Likewise, for the 2nd fraction, since 40 × 21 = 840,
6/40 = 6 × 21/40 × 21 = 126/840 - Add the two like fractions:
3600/840 + 126/840 = 3600 + 126/840 = 3726/840 - 3726/840 simplified gives 621/140
- So, 90/21 + 6/40 = 621/140
In mixed form: 461/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/21+12/40 90/42+6/40 90/21+6/80 90/21+18/40 90/63+6/40 90/21+30/40 90/21+42/40