Add 42/54 and 20/70
42/54 + 20/70 is 67/63.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 54 and 70 is 1890
Next, find the equivalent fraction of both fractional numbers with denominator 1890 - For the 1st fraction, since 54 × 35 = 1890,
42/54 = 42 × 35/54 × 35 = 1470/1890 - Likewise, for the 2nd fraction, since 70 × 27 = 1890,
20/70 = 20 × 27/70 × 27 = 540/1890 - Add the two like fractions:
1470/1890 + 540/1890 = 1470 + 540/1890 = 2010/1890 - 2010/1890 simplified gives 67/63
- So, 42/54 + 20/70 = 67/63
In mixed form: 14/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/54+20/70 42/54+40/70 42/54+60/70