There are two ways to multiply and divide by 10 - the proper way and the cheating way. The cheating way to a sum such as 5 x 10 is to stick a zero on the 5 (so 5 x 10 = 50). The cheating way to do a sum such as 70 ÷ 10 is to knock a zero off the 70 (so 70 ÷ 10 = 7). As for the proper way, you start talking about place value and place holders and digits shifting along one to the left when x, and one to the right when ÷. We'll talk about that later...

There are two ways to multiply and divide by 100 - the proper way and the cheating way. The cheating way to a sum such as 5 x 100 is to stick two zeros on the 5 (so 5 x 100 = 500). The cheating way to do a sum such as 700 ÷ 100 is to knock two zeros off the 700 (so 700 ÷ 100 = 7). As for the proper way, you start talking about place value and plave holders and digits shifting along two to the left when x, and two to the right when ÷. We'll talk about that later...

2-D stands for 'two-dimensional'. It is a flat shape, like one drawn on a board or a shadow. You can only measure it in two directions: along and across. (O.k., if a shadow is on a wall, it would be across and up, but you can still only measure it in two directions).

3-D stands for 'three-dimensional'. It is any object that is not flat, like you or a building. You can measure it in three directions: across, along and up.