Add 90/70 and 3/72
1st number: 1 20/70, 2nd number: 3/72
90/70 + 3/72 is 223/168.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 72 is 2520
Next, find the equivalent fraction of both fractional numbers with denominator 2520 - For the 1st fraction, since 70 × 36 = 2520,
90/70 = 90 × 36/70 × 36 = 3240/2520 - Likewise, for the 2nd fraction, since 72 × 35 = 2520,
3/72 = 3 × 35/72 × 35 = 105/2520 - Add the two like fractions:
3240/2520 + 105/2520 = 3240 + 105/2520 = 3345/2520 - 3345/2520 simplified gives 223/168
- So, 90/70 + 3/72 = 223/168
In mixed form: 155/168
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/70+6/72 90/70+9/72 90/70+15/72 90/70+21/72