Add 90/70 and 15/30
1st number: 1 20/70, 2nd number: 15/30
90/70 + 15/30 is 25/14.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 30 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 70 × 3 = 210,
90/70 = 90 × 3/70 × 3 = 270/210 - Likewise, for the 2nd fraction, since 30 × 7 = 210,
15/30 = 15 × 7/30 × 7 = 105/210 - Add the two like fractions:
270/210 + 105/210 = 270 + 105/210 = 375/210 - 375/210 simplified gives 25/14
- So, 90/70 + 15/30 = 25/14
In mixed form: 111/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/70+15/60 90/70+45/30 90/70+15/90 90/70+75/30