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Because in the question Tom saved 50 cent and 20 cent coins and the number 30 is the biggest possible number we have.

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Because 30is the biggest number

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Because there are more 20 cent coins then 50 cent coins

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Because 2/3 is the other half of the 20 cent coins as there is more 20 cent coins then 50 cent coins

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This is because Tom has 20 cent and 30 cent than you add it you will get 30 cent

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This is because Tom has 20 cent and 30 cent than you add it you will get 30 cent

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Because there are more 20 then 10 as it state that more 20cm than 20 cent than 50cent

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By using part-part-whole.

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Because there is 10 50 cent coins and 20 20 cent coins
10+20=30

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The piggy bank has 10-50 cents and 20 20-cents. 10+20=30

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Nothing.

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Because 10 is 1/3 of 30

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This is because 20 cent has more than 50 cent so there are 10 50 cents coins and 20 20 cents coins.

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This is because 20 cent has more than 50 cent so there are 10 50 cents coins and 20 20 cents coins.

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There are more 20 cent than 50 cent

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I don’t find it difficult

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I used add and subtraction

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Amongst the 30 coins, 10 of them were fifty-cent coins.

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It was comfusing

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I did not know what to do.