Video Transcript
What number is missing from this
number line?
We’re given a number line here,
which is just a line with lots of numbers written in order. And we’re asked, what number is
missing from the number line? Now, to find the answer, we need to
do two things. Firstly, we need to look at where
the missing number is. And then once we’ve done that, we
need to think carefully about what the number line shows.
Now, our missing number is here,
isn’t it? That’s why we’ve got this empty
box. It’s the number that comes after
913 but before 915. In fact, we could say it’s in
between 913 and 915. Now that we’ve looked at the
position of our missing number, let’s look at the whole number line. What do we notice? We can see that it starts with the
number 900. It goes all the way up to 920. And if we count along the number
line, we can see that we’re counting in ones. 900, 901, 902, 903, and so on. We could say that the scale of this
number line is to count or jump in ones each time.
So if we come all the way across
now and look at our missing number, we know that it’s going to be one more than
913. We know that one more than 13 is
14. And so one more than 913 is
914. And if we count the numbers around
our missing number, we can see that it fits in perfectly. 913, 914, 915, and so on. The number line shows a scale where
we’re counting in ones. And we know then that our missing
number is going to be 914.
