Add 4/12 and 90/70
1st number: 4/12, 2nd number: 1 20/70
4/12 + 90/70 is 34/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 70 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 12 × 35 = 420,
4/12 = 4 × 35/12 × 35 = 140/420 - Likewise, for the 2nd fraction, since 70 × 6 = 420,
90/70 = 90 × 6/70 × 6 = 540/420 - Add the two like fractions:
140/420 + 540/420 = 140 + 540/420 = 680/420 - 680/420 simplified gives 34/21
- So, 4/12 + 90/70 = 34/21
In mixed form: 113/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/12+90/70 4/24+90/70 4/36+90/70 20/12+90/70 4/60+90/70 28/12+90/70 4/84+90/70