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Crossing the Bridge

Four friends must cross a bridge. How can they all cross it in just 17 minutes?

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A man has 5 coins in his pocket. Given the clues, can you work out what the coins are?

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Flow Chart

The flow chart requires two numbers, M and N. Select several values for M and try to establish what the flow chart does.

Simple Counting Machine

Stage: 3 and 4 Challenge Level: Challenge Level:2 Challenge Level:2

Take a look at Circuit Maker and experiment with the interactivity provided.

There is more information on Logic Gates here