There are 20 creatures altogether. We can use a part-whole model to show the two groups and the total of 20. We can use a part-whole model to show the two groups and the total of 20. We can use a bar ...
Rodd has a bad cold and is at home bored, so he looks out of his window and counts the cars on a bridge. Realising that he needs to count more than 10, he has the idea of making an unusual abacus that ...
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