Add 54/42 and 12/90
1st number: 1 12/42, 2nd number: 12/90
54/42 + 12/90 is 149/105.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 90 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 42 × 15 = 630,
54/42 = 54 × 15/42 × 15 = 810/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
12/90 = 12 × 7/90 × 7 = 84/630 - Add the two like fractions:
810/630 + 84/630 = 810 + 84/630 = 894/630 - 894/630 simplified gives 149/105
- So, 54/42 + 12/90 = 149/105
In mixed form: 144/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/42+24/90 54/84+12/90 54/42+36/90 54/42+60/90 54/42+84/90