Add 90/63 and 80/15
1st number: 1 27/63, 2nd number: 5 5/15
90/63 + 80/15 is 142/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 63 and 15 is 315
Next, find the equivalent fraction of both fractional numbers with denominator 315 - For the 1st fraction, since 63 × 5 = 315,
90/63 = 90 × 5/63 × 5 = 450/315 - Likewise, for the 2nd fraction, since 15 × 21 = 315,
80/15 = 80 × 21/15 × 21 = 1680/315 - Add the two like fractions:
450/315 + 1680/315 = 450 + 1680/315 = 2130/315 - 2130/315 simplified gives 142/21
- So, 90/63 + 80/15 = 142/21
In mixed form: 616/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/63+80/30 90/63+80/45 90/63+80/75