Add 15/14 and 90/20
1st number: 1 1/14, 2nd number: 4 10/20
15/14 + 90/20 is 39/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 14 and 20 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 14 × 10 = 140,
15/14 = 15 × 10/14 × 10 = 150/140 - Likewise, for the 2nd fraction, since 20 × 7 = 140,
90/20 = 90 × 7/20 × 7 = 630/140 - Add the two like fractions:
150/140 + 630/140 = 150 + 630/140 = 780/140 - 780/140 simplified gives 39/7
- So, 15/14 + 90/20 = 39/7
In mixed form: 54/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/14+90/20 15/28+90/20 15/14+90/40 45/14+90/20 15/42+90/20 15/14+90/60 75/14+90/20 15/70+90/20 15/98+90/20