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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?

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Hockey

After some matches were played, most of the information in the table containing the results of the games was accidentally deleted. What was the score in each match played?

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Clock Squares

Square numbers can be represented on the seven-clock (representing these numbers modulo 7). This works like the days of the week.

Tree Tops

Stage: 3 Challenge Level: Challenge Level:2 Challenge Level:2

First you need to find the real profit for each tree type for every 10 years.

Try looking at different combinations of years....

Is it best to grow three lots of trees for 30 years if you have 90 years to maximise your profit?

How about a spreadsheet?