# N9c – Adding and subtracting in standard form

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Prerequisites
• Slides in PDF (one slide per page, suitable for importing into IWB software)

# Adding and subtracting in standard form

Teacher resources

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• Slides in PDF (one slide per page, suitable for importing into IWB software)
Links to past exam questions

Although there are no questions involving standard form in lesson N15a – Rounding numbers and measures to an appropriate degree of accuracy, once you have learned about rounding numbers to a given amount of significant figures, you should become comfortable with rounding numbers in standard form to a given number of significant figures. For example: $$7.286 \times 10^5\text{ rounds to }7.3 \times 10^5 \text{ to 2 significant figures}$$