Add 56/80 and 90/21
1st number: 56/80, 2nd number: 4 6/21
56/80 + 90/21 is 349/70.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 21 is 1680
Next, find the equivalent fraction of both fractional numbers with denominator 1680 - For the 1st fraction, since 80 × 21 = 1680,
56/80 = 56 × 21/80 × 21 = 1176/1680 - Likewise, for the 2nd fraction, since 21 × 80 = 1680,
90/21 = 90 × 80/21 × 80 = 7200/1680 - Add the two like fractions:
1176/1680 + 7200/1680 = 1176 + 7200/1680 = 8376/1680 - 8376/1680 simplified gives 349/70
- So, 56/80 + 90/21 = 349/70
In mixed form: 469/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/80+90/42 56/80+90/63