Subtract 12/70 from 21/27
21/27 - 12/70 is 191/315.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 27 and 70 is 1890
Next, find the equivalent fraction of both fractional numbers with denominator 1890 - For the 1st fraction, since 27 × 70 = 1890,
21/27 = 21 × 70/27 × 70 = 1470/1890 - Likewise, for the 2nd fraction, since 70 × 27 = 1890,
12/70 = 12 × 27/70 × 27 = 324/1890 - Subtract the two like fractions:
1470/1890 - 324/1890 = 1470 - 324/1890 = 1146/1890 - After reducing the fraction, the answer is 191/315
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/27-12/70 21/27-24/70 21/54-12/70 63/27-12/70 21/27-36/70 21/81-12/70 21/27-60/70 21/27-84/70