Add 12/40 and 12/90
12/40 + 12/90 is 13/30.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 90 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 40 × 9 = 360,
12/40 = 12 × 9/40 × 9 = 108/360 - Likewise, for the 2nd fraction, since 90 × 4 = 360,
12/90 = 12 × 4/90 × 4 = 48/360 - Add the two like fractions:
108/360 + 48/360 = 108 + 48/360 = 156/360 - 156/360 simplified gives 13/30
- So, 12/40 + 12/90 = 13/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/40+12/90 12/40+24/90 12/80+12/90 36/40+12/90 12/40+36/90 60/40+12/90 12/40+60/90 84/40+12/90 12/40+84/90