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Primary 4 | Maths
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Please help. I know the answer 20×21=420 by guess & check. May I know is there any other method beside guess & Check? Thank you.
Date Posted: 2 years ago
Views: 411
The best option for Primary 4 is guess and check.. else use √420 = 20.49390153, so, is 20×21 =420
Thank you so much.
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