Add 70/20 and 84/45
1st number: 3 10/20, 2nd number: 1 39/45
70/20 + 84/45 is 161/30.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 45 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 20 × 9 = 180,
70/20 = 70 × 9/20 × 9 = 630/180 - Likewise, for the 2nd fraction, since 45 × 4 = 180,
84/45 = 84 × 4/45 × 4 = 336/180 - Add the two like fractions:
630/180 + 336/180 = 630 + 336/180 = 966/180 - 966/180 simplified gives 161/30
- So, 70/20 + 84/45 = 161/30
In mixed form: 511/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/40+84/45 70/20+84/90 70/60+84/45