Add 70/54 and 80/21
1st number: 1 16/54, 2nd number: 3 17/21
70/54 + 80/21 is 965/189.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 54 and 21 is 378
Next, find the equivalent fraction of both fractional numbers with denominator 378 - For the 1st fraction, since 54 × 7 = 378,
70/54 = 70 × 7/54 × 7 = 490/378 - Likewise, for the 2nd fraction, since 21 × 18 = 378,
80/21 = 80 × 18/21 × 18 = 1440/378 - Add the two like fractions:
490/378 + 1440/378 = 490 + 1440/378 = 1930/378 - 1930/378 simplified gives 965/189
- So, 70/54 + 80/21 = 965/189
In mixed form: 520/189
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/54+80/42 70/54+80/63