Add 70/80 and 63/45
1st number: 70/80, 2nd number: 1 18/45
70/80 + 63/45 is 91/40.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 45 is 720
Next, find the equivalent fraction of both fractional numbers with denominator 720 - For the 1st fraction, since 80 × 9 = 720,
70/80 = 70 × 9/80 × 9 = 630/720 - Likewise, for the 2nd fraction, since 45 × 16 = 720,
63/45 = 63 × 16/45 × 16 = 1008/720 - Add the two like fractions:
630/720 + 1008/720 = 630 + 1008/720 = 1638/720 - 1638/720 simplified gives 91/40
- So, 70/80 + 63/45 = 91/40
In mixed form: 211/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/80+63/90