Number Sense
2008/2009 Circle 2 Problem 5
Hints
Suggestion: The list from the hundred chart, and possibly part a), could be done with the class as a
whole, to introduce the more thought-provoking ideas in parts b) and c).
Extension 2:
Hint 1 - What do you know about the sum of the digits of a number that is divisible by 3?
3