**This is the students’ version of the page. Log in above for the teachers’ version.**

Prerequisites

- A knowledge of the four operations from lessons N2a, N2b, N2c, N2d and N2e is assumed.
- N9a – Converting between normal numbers and standard form
- N9b – Multiplying and dividing in standard form

# Adding and subtracting in standard form

In the real world

**Teachers**: log in to view this content.

What next?

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: \(7.286 \times 10^5\text{ rounds to }7.3 \times 10^5 \text{ to 2 significant figures}\)