Add 70/63 and 18/20
1st number: 1 7/63, 2nd number: 18/20
70/63 + 18/20 is 181/90.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 63 and 20 is 1260
Next, find the equivalent fraction of both fractional numbers with denominator 1260 - For the 1st fraction, since 63 × 20 = 1260,
70/63 = 70 × 20/63 × 20 = 1400/1260 - Likewise, for the 2nd fraction, since 20 × 63 = 1260,
18/20 = 18 × 63/20 × 63 = 1134/1260 - Add the two like fractions:
1400/1260 + 1134/1260 = 1400 + 1134/1260 = 2534/1260 - 2534/1260 simplified gives 181/90
- So, 70/63 + 18/20 = 181/90
In mixed form: 21/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/63+36/20 70/63+18/40 70/63+54/20 70/63+18/60 70/63+90/20