Add 12/90 and 60/42
1st number: 12/90, 2nd number: 1 18/42
12/90 + 60/42 is 164/105.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 42 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 90 × 7 = 630,
12/90 = 12 × 7/90 × 7 = 84/630 - Likewise, for the 2nd fraction, since 42 × 15 = 630,
60/42 = 60 × 15/42 × 15 = 900/630 - Add the two like fractions:
84/630 + 900/630 = 84 + 900/630 = 984/630 - 984/630 simplified gives 164/105
- So, 12/90 + 60/42 = 164/105
In mixed form: 159/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/90+60/42 12/90+60/84 36/90+60/42 60/90+60/42 84/90+60/42