Add 30/70 and 63/40
1st number: 30/70, 2nd number: 1 23/40
30/70 + 63/40 is 561/280.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 40 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 70 × 4 = 280,
30/70 = 30 × 4/70 × 4 = 120/280 - Likewise, for the 2nd fraction, since 40 × 7 = 280,
63/40 = 63 × 7/40 × 7 = 441/280 - Add the two like fractions:
120/280 + 441/280 = 120 + 441/280 = 561/280 - So, 30/70 + 63/40 = 561/280
In mixed form: 21/280
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/70+63/40 30/70+63/80 90/70+63/40