Add 90/54 and 40/42
1st number: 1 36/54, 2nd number: 40/42
90/54 + 40/42 is 55/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 54 and 42 is 378
Next, find the equivalent fraction of both fractional numbers with denominator 378 - For the 1st fraction, since 54 × 7 = 378,
90/54 = 90 × 7/54 × 7 = 630/378 - Likewise, for the 2nd fraction, since 42 × 9 = 378,
40/42 = 40 × 9/42 × 9 = 360/378 - Add the two like fractions:
630/378 + 360/378 = 630 + 360/378 = 990/378 - 990/378 simplified gives 55/21
- So, 90/54 + 40/42 = 55/21
In mixed form: 213/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/54+80/42 90/54+40/84