A rectangular prism is measured 84 cm(l) x 42cm (w) x 56cm h. What is the largest size cube that fits the dimensions of the prism? Number of cubes required? Maximum length of the edge of the cube that fits 64cm, 42cm, and 56cm is _____cm. Number of cubes____
If the side of the cube is longer than 42 it sticks out of the prism. Two of them will fit in there because the prism is twice as long as the cube. (84 = 2 * 42)
Obviously if you make that 84 length smaller, only one will fit in.