Add 70/90 and 21/4
1st number: 70/90, 2nd number: 5 1/4
70/90 + 21/4 is 217/36.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 4 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 90 × 2 = 180,
70/90 = 70 × 2/90 × 2 = 140/180 - Likewise, for the 2nd fraction, since 4 × 45 = 180,
21/4 = 21 × 45/4 × 45 = 945/180 - Add the two like fractions:
140/180 + 945/180 = 140 + 945/180 = 1085/180 - 1085/180 simplified gives 217/36
- So, 70/90 + 21/4 = 217/36
In mixed form: 61/36
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/90+42/4 70/90+21/8 70/90+63/4 70/90+21/12 70/90+21/20 70/90+21/28