Have a look at the problems below. The first problem is based on the idea of finding differences between numbers, and then seeing if the answer is odd or even. The second builds on the first by changing the number of numbers you are dealing with. Try to investigate them both and see what you find. Remember to think what if… You can add any thoughts to this post as a comment.
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Its time to revise our time knowledge. Have a go at the different challenges on the Stop the Clock site. After a bit of practice have a go at this problem – its a game of tactics and time knowledge. Once you have played a game a few times have a think about these questions:
What happens if your opponent gets to 10.30? Why?