Add 20/70 and 45/12
1st number: 20/70, 2nd number: 3 9/12
20/70 + 45/12 is 113/28.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 12 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 70 × 6 = 420,
20/70 = 20 × 6/70 × 6 = 120/420 - Likewise, for the 2nd fraction, since 12 × 35 = 420,
45/12 = 45 × 35/12 × 35 = 1575/420 - Add the two like fractions:
120/420 + 1575/420 = 120 + 1575/420 = 1695/420 - 1695/420 simplified gives 113/28
- So, 20/70 + 45/12 = 113/28
In mixed form: 41/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/70+45/12 20/70+90/12 20/70+45/24 60/70+45/12 20/70+45/36 20/70+45/60 20/70+45/84