Add 42/21 and 16/90
1st number: 2 0/21, 2nd number: 16/90
42/21 + 16/90 is 98/45.
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,
42/21 = 42 × 30/21 × 30 = 1260/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
16/90 = 16 × 7/90 × 7 = 112/630 - Add the two like fractions:
1260/630 + 112/630 = 1260 + 112/630 = 1372/630 - 1372/630 simplified gives 98/45
- So, 42/21 + 16/90 = 98/45
In mixed form: 28/45
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/21+16/90 42/21+32/90 42/21+48/90 42/63+16/90 42/21+80/90