Question 1018064
Line up the numbers.

4 x 9 x 2
2 x 3 x 2

You can see the dimensions are multiples of each other, 4 is 2 2's, 9 is 3 3's

So the small boxes fit 2 x 3 x 1 or 6 small boxes will fit in larger one. 

Larger has 72 cu inches
Smaller has 12 cu inches, so we did it correctly. 72/12=6