Add 28/4 and 12/90
1st number: 7 0/4, 2nd number: 12/90
28/4 + 12/90 is 107/15.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 90 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 4 × 45 = 180,
28/4 = 28 × 45/4 × 45 = 1260/180 - Likewise, for the 2nd fraction, since 90 × 2 = 180,
12/90 = 12 × 2/90 × 2 = 24/180 - Add the two like fractions:
1260/180 + 24/180 = 1260 + 24/180 = 1284/180 - 1284/180 simplified gives 107/15
- So, 28/4 + 12/90 = 107/15
In mixed form: 72/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/4+12/90 28/4+24/90 28/8+12/90 84/4+12/90 28/4+36/90 28/12+12/90 28/4+60/90 28/20+12/90 28/4+84/90