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