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Starting at 0 we can count up in 9s like this:
0 9 18 27 36 45 54 63 72 81 90 99 108 ...
We add 9 to the previous number to get the next.
These are the multiples of 9.
Notice that the digits of each multiple add up to 9 or a multiple of 9
(2 + 7 = 9, 4 + 5 = 9, 9 + 9 = 18, 1 + 0 + 8 = 9 etc.)
Example
When we count up in 9s, what comes after 45?
Answer
Start with a multiple of 9 that you know (such as 3 x 9 = 27)
27 36 45 54
Example
When we count up in 9s, what comes before 90?
Answer
List the multiples of 9 near 90.
72 81 90 99 108
How do you feel about that?
Let's practise this in the following questions.
