Add 70/20 and 63/90
1st number: 3 10/20, 2nd number: 63/90
70/20 + 63/90 is 21/5.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 90 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 20 × 9 = 180,
70/20 = 70 × 9/20 × 9 = 630/180 - Likewise, for the 2nd fraction, since 90 × 2 = 180,
63/90 = 63 × 2/90 × 2 = 126/180 - Add the two like fractions:
630/180 + 126/180 = 630 + 126/180 = 756/180 - 756/180 simplified gives 21/5
- So, 70/20 + 63/90 = 21/5
In mixed form: 41/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/40+63/90 70/60+63/90