Question Video: Skip Counting Backward by 10s Using a Vertical Number Line | Nagwa Question Video: Skip Counting Backward by 10s Using a Vertical Number Line | Nagwa

# Question Video: Skip Counting Backward by 10s Using a Vertical Number Line Mathematics

Subtract 10 each time when skip counting backward by 10s. Fill in the next 3 numbers.

02:31

### Video Transcript

Subtract 10 each time when skip counting backward by 10s. Fill in the next three numbers.

Can you see what we have in the picture here? It’s a number line, but it’s a number line with a difference. You might be used to number lines that go from left to right, and we read along them. Well, in the picture, we can see a number line that goes up and down, and we’re going to need to read it looking up and down. We can see that there are some numbers at the top of this number line. So let’s start at the top and read down. 120, 110, 100. And then we have three empty boxes. And we can see at the bottom of the question that we’re going to need to fill in these next three numbers.

To do that, we need to understand what’s happening on our number line. In the first sentence, we’re told how to find the answer. We need to skip count backward by 10s. If we look at the other side of our number line, we can see some green arrows that say subtract 10, subtract 10. So what’s happening as we’re going from 120 to 110 to 100 is we’re taking away 10 or counting backward in 10 every time. So, to fill in the next three numbers, we need to carry on skip counting backward by 10s. But we’re going to start with a number that we got to, which was 100.

Now, 100 is the same as 10 lots of 10. As we skip count backwards in 10s, we need to take away one more lot of 10 every time. So instead of 10 10s, we’re going to have nine 10s. And nine 10s are worth 90. If we subtract another lot of 10, we’re going to go from nine 10s to eight 10s, and 90 becomes 80. And if we subtract one more 10 from 80, we’re going to have 70. We carried on skip counting backward by 10s by subtracting 10 every time: 120, 110, 100, 90, 80, 70. The missing three numbers in our pattern were 90, 80, and then 70.

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