Video Transcript
If I stack these cubes on top of
each other, what will the total height be?
In the picture underneath the
question, we can see two cubes. At the moment, they’re side by
side. But our question wants us to
imagine stacking the cubes on top of each other. And if we do that, they’re going to
become taller, aren’t they? And our question wants us to work
out what the total height would be if we put one on top of the other. To find the answer, we’re going to
have to measure these cubes. And to help us, we’ve got two
rulers.
The way the first ruler has been
positioned, we can see that zero on the scale is level with the bottom of the
cube. So, we start counting at zero. And if we look at the very top of
the cube, this is level with the number eight on our ruler. So, the first cube is eight. But eight what? If you turn your head and look at
the ruler, you might be able to see the letters cm near the number zero. These letters stand for
centimeters. Our first cube is eight centimeters
tall.
Now, what about our second
cube? Looks like it’s going to be a
little bit smaller than eight, doesn’t it? To begin with, we need to check
that our ruler is matched up so that zero is level with the bottom of our cube. So, we can start counting from
zero. And if we look, the top of our cube
is level with the number six. This cube is six centimeters
tall.
Now that we’ve measured both of our
cubes, we need to use what we’ve found to find the total height. Eight plus six equals what? Eight counters plus six more equals
nine, 10, 11, 12, 13, 14. And because eight plus six equals
14, we can now use this to answer the question. If we stack the cubes on top of
each other, their total height will be 14 centimeters.
