As may be observed (and is mentioned above), these three numbers have a multiplicative relationship; in other words, 4 x 6 = 24.

Add to this the capability of inverting an operation, and the fact that division is the opposite of multiplication, and you have an easy collection of 8 facts:

4 x 6 = 24

6 x 4 = 24

24 / 4 = 6

24 / 6 = 4

24 = 4 x 6

24 = 6 x 4

6 = 24 / 4

4 = 24 / 6

Add to this the capability of inverting an operation, and the fact that division is the opposite of multiplication, and you have an easy collection of 8 facts:

4 x 6 = 24

6 x 4 = 24

24 / 4 = 6

24 / 6 = 4

24 = 4 x 6

24 = 6 x 4

6 = 24 / 4

4 = 24 / 6