Add 16/21 and 72/90
16/21 + 72/90 is 164/105.
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,
16/21 = 16 × 30/21 × 30 = 480/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
72/90 = 72 × 7/90 × 7 = 504/630 - Add the two like fractions:
480/630 + 504/630 = 480 + 504/630 = 984/630 - 984/630 simplified gives 164/105
- So, 16/21 + 72/90 = 164/105
In mixed form: 159/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 32/21+72/90 16/42+72/90 48/21+72/90 16/63+72/90 80/21+72/90