Add 70/21 and 42/63
1st number: 3 7/21, 2nd number: 42/63
70/21 + 42/63 is 4/1.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 63 is 63
Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 21 × 3 = 63,
70/21 = 70 × 3/21 × 3 = 210/63 - Likewise, for the 2nd fraction, since 63 × 1 = 63,
42/63 = 42 × 1/63 × 1 = 42/63 - Add the two like fractions:
210/63 + 42/63 = 210 + 42/63 = 252/63 - 252/63 simplified gives 4/1
- So, 70/21 + 42/63 = 4/1
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/21+84/63 70/42+42/63 70/63+42/63