Add 21/70 and 42/27
1st number: 21/70, 2nd number: 1 15/27
21/70 + 42/27 is 167/90.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 27 is 1890
Next, find the equivalent fraction of both fractional numbers with denominator 1890 - For the 1st fraction, since 70 × 27 = 1890,
21/70 = 21 × 27/70 × 27 = 567/1890 - Likewise, for the 2nd fraction, since 27 × 70 = 1890,
42/27 = 42 × 70/27 × 70 = 2940/1890 - Add the two like fractions:
567/1890 + 2940/1890 = 567 + 2940/1890 = 3507/1890 - 3507/1890 simplified gives 167/90
- So, 21/70 + 42/27 = 167/90
In mixed form: 177/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/70+42/27 21/70+84/27 21/70+42/54 63/70+42/27 21/70+42/81