Add 90/84 and 15/45
1st number: 1 6/84, 2nd number: 15/45
90/84 + 15/45 is 59/42.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 45 is 1260
Next, find the equivalent fraction of both fractional numbers with denominator 1260 - For the 1st fraction, since 84 × 15 = 1260,
90/84 = 90 × 15/84 × 15 = 1350/1260 - Likewise, for the 2nd fraction, since 45 × 28 = 1260,
15/45 = 15 × 28/45 × 28 = 420/1260 - Add the two like fractions:
1350/1260 + 420/1260 = 1350 + 420/1260 = 1770/1260 - 1770/1260 simplified gives 59/42
- So, 90/84 + 15/45 = 59/42
In mixed form: 117/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/84+30/45 90/84+15/90 90/84+75/45