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Consecutive Numbers

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I'm Eight

Find a great variety of ways of asking questions which make 8.

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Calendar Capers

Choose any three by three square of dates on a calendar page. Circle any number on the top row, put a line through the other numbers that are in the same row and column as your circled number. Repeat this for a number of your choice from the second row. You should now have just one number left on the bottom row, circle it. Find the total for the three numbers circled. Compare this total with the number in the centre of the square. What do you find? Can you explain why this happens?

Debt Recovery

Stage: 3 Short Challenge Level: Challenge Level:1

Tony owes Tina 40p. Then Tina borrows 50p from Tony. Later Tony gives Tina 60p. Who has to pay what to whom to square things up?

If you liked this problem, here is an NRICH task which challenges you to use similar mathematical ideas.

This problem is taken from the UKMT Mathematical Challenges.
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