By how much would the area of this triangle increase if its base was enlarged to 8cm?
Either estimate the lengths of the red lines or, if you know how, calculate how long they are.
Can you find three square numbers where the third is the sum of the first two?
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Can you get your car out of the very crowded car park by moving other cars forwards or backwards? There are five levels of increasing difficulty and the interactive interface makes this a fun problem solving exercise.
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