Add 70/80 and 21/63
70/80 + 21/63 is 29/24.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 63 is 5040
Next, find the equivalent fraction of both fractional numbers with denominator 5040 - For the 1st fraction, since 80 × 63 = 5040,
70/80 = 70 × 63/80 × 63 = 4410/5040 - Likewise, for the 2nd fraction, since 63 × 80 = 5040,
21/63 = 21 × 80/63 × 80 = 1680/5040 - Add the two like fractions:
4410/5040 + 1680/5040 = 4410 + 1680/5040 = 6090/5040 - 6090/5040 simplified gives 29/24
- So, 70/80 + 21/63 = 29/24
In mixed form: 15/24
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/80+42/63