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Biscuit Decorations

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?

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Writing Digits

Lee was writing all the counting numbers from 1 to 20. She stopped for a rest after writing seventeen digits. What was the last number she wrote?

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Next Domino

Which comes next in each pattern of dominoes?

6 Beads

Stage: 1 Challenge Level: Challenge Level:2 Challenge Level:2

It might help to use some equipment e.g. counters, beads, pebbles etc.
How will you know you have found all the different ways?