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Before dividing, decompose 420 to make it easier to divide by 4.
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Before dividing, decompose 420 to make it easier to divide by 4.

User TomRichardson
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First you can do 400 dived by 4 which is 100 and 20 dived by 4 which is 5 making the answer 105
User MariusBudin
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