Add 20/15 and 72/63
1st number: 1 5/15, 2nd number: 1 9/63
20/15 + 72/63 is 52/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 63 is 315
Next, find the equivalent fraction of both fractional numbers with denominator 315 - For the 1st fraction, since 15 × 21 = 315,
20/15 = 20 × 21/15 × 21 = 420/315 - Likewise, for the 2nd fraction, since 63 × 5 = 315,
72/63 = 72 × 5/63 × 5 = 360/315 - Add the two like fractions:
420/315 + 360/315 = 420 + 360/315 = 780/315 - 780/315 simplified gives 52/21
- So, 20/15 + 72/63 = 52/21
In mixed form: 210/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/15+72/63 20/30+72/63 60/15+72/63 20/45+72/63 20/75+72/63