Add 42/21 and 90/42
1st number: 2 0/21, 2nd number: 2 6/42
42/21 + 90/42 is 29/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 42 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 21 × 2 = 42,
42/21 = 42 × 2/21 × 2 = 84/42 - Likewise, for the 2nd fraction, since 42 × 1 = 42,
90/42 = 90 × 1/42 × 1 = 90/42 - Add the two like fractions:
84/42 + 90/42 = 84 + 90/42 = 174/42 - 174/42 simplified gives 29/7
- So, 42/21 + 90/42 = 29/7
In mixed form: 41/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/21+90/42 42/21+90/84 42/63+90/42