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In the calculation below, the box represents a missing digit:
What could go in the box? What would the total be each time?
Which is the highest/lowest total?
Which totals are odd/even?
What is the greatest number of squares you can make by overlapping three squares?
Find all the numbers that can be made by adding the dots on two dice.
Andrew decorated 20 biscuits to take to a party. He lined them up and put icing on every second biscuit and different decorations on other biscuits. How many biscuits weren't decorated?