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Standard form is basically approximation. If the question says answer to one S.F, look at the number, draw a dotted line after the first number (must not be a zero) look at the second number and if it is more than 5 then add 1 to the first number. Ensure theat if the number is 5390 (to 1 S.F) that you do not answer: 5 but instead answer 5000. ( I used to make that mistake)

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13y ago

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