pptx, 63.55 KB
pptx, 63.55 KB
Print this out onto A4 cards. Give two cards to each table (choose size of number according to ability). Ask them to come up with reasons how we know that they are all divisible by three.

Hopefully they will get that it is the sum of digits which are multiples of three.

Show the PowerPoint to recap.

Back up with other exercises to reinforce this. Then evaluate/consolidate their knowledge by showing them new numbers and asking whether they are divisible by three or not.

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