Add 70/90 and 81/4
1st number: 70/90, 2nd number: 20 1/4
70/90 + 81/4 is 757/36.
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,
81/4 = 81 × 45/4 × 45 = 3645/180 - Add the two like fractions:
140/180 + 3645/180 = 140 + 3645/180 = 3785/180 - 3785/180 simplified gives 757/36
- So, 70/90 + 81/4 = 757/36
In mixed form: 211/36
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/90+81/8 70/90+81/12 70/90+81/20 70/90+81/28