Question P5 Large numbers and operation order
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Calculate 408 × 200 without a calculator.
Answer
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Large numbers and operation order
Group digits by place value, then do brackets and multiplication or division before addition or subtraction.
In this one. Multiplying by 300 means multiplying by 3 and by 100. The non-zero digit matters as well as the zeros.
Two numbers to add with carrying, several numbers to put in order, or a sum mixing addition, multiplication and brackets, all point here.
Children forget to carry a ten into the next column, or compare digits from the left without first checking the numbers have the same number of digits.
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