the 3 in 350 represents 3 hundred's ( 3 100's ) while the 3 in 403 represents 3 units ( 3 1's )
To determine the number of cubes he needs to fill the box (this is assuming the cubes are 1 in cubes, he would need to calculate the volume of the box. To find the volume he would multiply the length by the width by the height. This would be 5 in x 6 in x 7 in. The volume is 210 cubic inches, so he could fill it with 210 one inch cubes.
Are you solving for x or y?
10 + 4*3 + 4*2 + 5 + 2 =
<span>10 + 12 + 8 +7 = </span>
<span>22 + 8 +7 = </span>
<span>30 + 7 =37</span>
