Add 90/84 and 42/45
1st number: 1 6/84, 2nd number: 42/45
90/84 + 42/45 is 421/210.
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,
42/45 = 42 × 28/45 × 28 = 1176/1260 - Add the two like fractions:
1350/1260 + 1176/1260 = 1350 + 1176/1260 = 2526/1260 - 2526/1260 simplified gives 421/210
- So, 90/84 + 42/45 = 421/210
In mixed form: 21/210
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/84+84/45 90/84+42/90