Add 84/42 and 90/21
1st number: 2 0/42, 2nd number: 4 6/21
84/42 + 90/21 is 44/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 21 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 42 × 1 = 42,
84/42 = 84 × 1/42 × 1 = 84/42 - Likewise, for the 2nd fraction, since 21 × 2 = 42,
90/21 = 90 × 2/21 × 2 = 180/42 - Add the two like fractions:
84/42 + 180/42 = 84 + 180/42 = 264/42 - 264/42 simplified gives 44/7
- So, 84/42 + 90/21 = 44/7
In mixed form: 62/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/42+90/42 84/42+90/63