Add 81/7 and 20/45
1st number: 11 4/7, 2nd number: 20/45
81/7 + 20/45 is 757/63.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 45 is 315
Next, find the equivalent fraction of both fractional numbers with denominator 315 - For the 1st fraction, since 7 × 45 = 315,
81/7 = 81 × 45/7 × 45 = 3645/315 - Likewise, for the 2nd fraction, since 45 × 7 = 315,
20/45 = 20 × 7/45 × 7 = 140/315 - Add the two like fractions:
3645/315 + 140/315 = 3645 + 140/315 = 3785/315 - 3785/315 simplified gives 757/63
- So, 81/7 + 20/45 = 757/63
In mixed form: 121/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/7+40/45 81/14+20/45 81/7+20/90 81/7+60/45 81/21+20/45 81/35+20/45 81/49+20/45