Add 40/90 and 80/84
40/90 + 80/84 is 88/63.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 84 is 1260
Next, find the equivalent fraction of both fractional numbers with denominator 1260 - For the 1st fraction, since 90 × 14 = 1260,
40/90 = 40 × 14/90 × 14 = 560/1260 - Likewise, for the 2nd fraction, since 84 × 15 = 1260,
80/84 = 80 × 15/84 × 15 = 1200/1260 - Add the two like fractions:
560/1260 + 1200/1260 = 560 + 1200/1260 = 1760/1260 - 1760/1260 simplified gives 88/63
- So, 40/90 + 80/84 = 88/63
In mixed form: 125/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/90+80/84