When working out how much more to make a number of up to 100 it important not to mix up two different ways to do it. Let's ask the question:
' How much more there is of 45 to 100? "
One way to do this is to add 5 to 45, 50 and then count on 50 to 100. That is a total of 55.
Another way is to count on in dozens of 45 to 95, that is 50, and then add it to the extra 5, again making 55.
Watch out for children who get something confised, adding at from 40 to 100, 60, and then on another 5. This method will always lead to ten more than the correct answer.
The ultimate goal of questions such as these is to make the answers second nature or even know them off by heart. "
This page can be found in our annual 3, calculation of the section.
Full number of sentences (pg 2)
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