Add 21/64 and 20/70
21/64 + 20/70 is 275/448.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 64 and 70 is 2240
Next, find the equivalent fraction of both fractional numbers with denominator 2240 - For the 1st fraction, since 64 × 35 = 2240,
21/64 = 21 × 35/64 × 35 = 735/2240 - Likewise, for the 2nd fraction, since 70 × 32 = 2240,
20/70 = 20 × 32/70 × 32 = 640/2240 - Add the two like fractions:
735/2240 + 640/2240 = 735 + 640/2240 = 1375/2240 - 1375/2240 simplified gives 275/448
- So, 21/64 + 20/70 = 275/448
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/64+20/70 21/64+40/70 63/64+20/70 21/64+60/70