Add 84/18 and 12/40
1st number: 4 12/18, 2nd number: 12/40
84/18 + 12/40 is 149/30.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 40 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 18 × 20 = 360,
84/18 = 84 × 20/18 × 20 = 1680/360 - Likewise, for the 2nd fraction, since 40 × 9 = 360,
12/40 = 12 × 9/40 × 9 = 108/360 - Add the two like fractions:
1680/360 + 108/360 = 1680 + 108/360 = 1788/360 - 1788/360 simplified gives 149/30
- So, 84/18 + 12/40 = 149/30
In mixed form: 429/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/18+24/40 84/36+12/40 84/18+12/80 84/18+36/40 84/54+12/40 84/18+60/40 84/90+12/40 84/18+84/40