Add 70/20 and 90/84
1st number: 3 10/20, 2nd number: 1 6/84
70/20 + 90/84 is 32/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 84 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 20 × 21 = 420,
70/20 = 70 × 21/20 × 21 = 1470/420 - Likewise, for the 2nd fraction, since 84 × 5 = 420,
90/84 = 90 × 5/84 × 5 = 450/420 - Add the two like fractions:
1470/420 + 450/420 = 1470 + 450/420 = 1920/420 - 1920/420 simplified gives 32/7
- So, 70/20 + 90/84 = 32/7
In mixed form: 44/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/40+90/84 70/60+90/84