Add 20/45 and 12/7
1st number: 20/45, 2nd number: 1 5/7
20/45 + 12/7 is 136/63.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 7 is 315
Next, find the equivalent fraction of both fractional numbers with denominator 315 - For the 1st fraction, since 45 × 7 = 315,
20/45 = 20 × 7/45 × 7 = 140/315 - Likewise, for the 2nd fraction, since 7 × 45 = 315,
12/7 = 12 × 45/7 × 45 = 540/315 - Add the two like fractions:
140/315 + 540/315 = 140 + 540/315 = 680/315 - 680/315 simplified gives 136/63
- So, 20/45 + 12/7 = 136/63
In mixed form: 210/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/45+12/7 20/45+24/7 20/90+12/7 20/45+12/14 60/45+12/7 20/45+36/7 20/45+12/21 20/45+60/7 20/45+12/35 20/45+84/7 20/45+12/49