Add 42/45 and 12/30
42/45 + 12/30 is 4/3.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 30 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 45 × 2 = 90,
42/45 = 42 × 2/45 × 2 = 84/90 - Likewise, for the 2nd fraction, since 30 × 3 = 90,
12/30 = 12 × 3/30 × 3 = 36/90 - Add the two like fractions:
84/90 + 36/90 = 84 + 36/90 = 120/90 - 120/90 simplified gives 4/3
- So, 42/45 + 12/30 = 4/3
In mixed form: 11/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/45+12/30 42/45+24/30 42/90+12/30 42/45+12/60 42/45+36/30 42/45+12/90 42/45+60/30 42/45+84/30