Add 20/14 and 90/21
1st number: 1 6/14, 2nd number: 4 6/21
20/14 + 90/21 is 40/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 14 and 21 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 14 × 3 = 42,
20/14 = 20 × 3/14 × 3 = 60/42 - Likewise, for the 2nd fraction, since 21 × 2 = 42,
90/21 = 90 × 2/21 × 2 = 180/42 - Add the two like fractions:
60/42 + 180/42 = 60 + 180/42 = 240/42 - 240/42 simplified gives 40/7
- So, 20/14 + 90/21 = 40/7
In mixed form: 55/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/14+90/21 20/28+90/21 20/14+90/42 60/14+90/21 20/42+90/21 20/14+90/63 20/70+90/21 20/98+90/21