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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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Doubling Fives

Stage: 1 Challenge Level: Challenge Level:1

This challenge is about doubling multiples of 5.

Pick a multiple of 5. Double it.

What is your answer? How many 10s is this?

Can you spot any patterns?

Can you explain the patterns?