Add 70/4 and 21/90
1st number: 17 2/4, 2nd number: 21/90
70/4 + 21/90 is 266/15.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 90 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 4 × 45 = 180,
70/4 = 70 × 45/4 × 45 = 3150/180 - Likewise, for the 2nd fraction, since 90 × 2 = 180,
21/90 = 21 × 2/90 × 2 = 42/180 - Add the two like fractions:
3150/180 + 42/180 = 3150 + 42/180 = 3192/180 - 3192/180 simplified gives 266/15
- So, 70/4 + 21/90 = 266/15
In mixed form: 1711/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/4+42/90 70/8+21/90 70/4+63/90 70/12+21/90 70/20+21/90 70/28+21/90