These are the topics in worksheets 43, 44, 45, 46. These are in the week one from 2008. You can print them out if you happen to have lost them or you are traveling and you need to get your hands on them wherever you are.
The worksheets give good examples and although they might look daunting, they shouldn't take too long. The one exercise that might take a little time (5 minutes!) is the chart of the prime numbers between 1 and 100. That is really worth doing. I will be recommending that you save it in your cahier for the years to come.
You will never forget what a prime number is if you do this exercise. It is exercise number 8 and it is on p. 45.
If you forget any divisibility rules or have curiosity about those we didn't cover, you can check those out on p. 47, also under that first week in 2008.
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