Numbers can be placed in order on a number line like this:
When there are numbers missing, say them in your head as you move along the line.
Example
Match the missing numbers on this number line to the letters.
Answer
Here we say
15... 16... 17... 18... 19... 20... 21... 22... 23... 24... 25
So
A is 20
B is 16
C is 23
Make sure that you write the correct number for each letter because they may be out of order, as they are in the example above.
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Question
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Teacher explanation