Question Video: Adding Two Lengths in Centimeters Mathematics

If I stack these cubes on top of each other, what will the total height be?

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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.

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