First of all, make sure you know what "division" means! Division means making equal groups, or sharing something equally.
Making groups will always work. However, it can take a long time. Since dividing is the opposite of multiplying, the best way to learn the division facts is to "Think Multiplication."
For example, 42 divided by 6 = ?
*Think: What times 6 makes 42?
6 x 7 makes 42.
So the answer is 7.
Other tips
Just as doubling came in very handy for multiplication, halving helps us to divide quickly.
*Half of something means dividing it by 2.
18 divided by 2 = ?
Half of 18 is 9.
The answer is 9.
*Finding half and half again helps us to divide by 4.
28 divided by 4 = ?
Half of 28 is 14.
Half of 14 is 7.
So the answer is 7.
Halves to Memorize
Half of 12 is 6.
Half of 14 is 7.
Half of 16 is 8.
Half of 18 is 9.
Half of 20 is 10.
Half of 22 is 11.
Half of 24 is 12.
Half of 26 is 13.
Half of 28 is 14.
Half of 30 is 15.
Half of 32 is 16.