# Rounding and Scientific Notation

### Rounding

### Video

This video from *Khan Academy* shows gives examples of rounding whole numbers to the nearest ten, hundred and thousand.

Note: All *Khan Academy* content is available for free at www.khanacademy.org.

This video from *Khan Academy* shows how to round to the nearest tenth and hundredth using examples.

Note: All *Khan Academy* content is available for free at www.khanacademy.org.

This video from *Khan Academy* gives an example of estimating the sum of two whole numbers using rounding.

Note: All *Khan Academy* content is available for free at www.khanacademy.org.

This video from *patrickJMT* shows how to estimate the result of some decimal arithmetic operations by rounding.

Note: All *patrickJMT* content is available for free at www.youtube.com/user/patrickJMT.

Patrick JMT’s Website: www.patrickjmt.com.

### Notes

Pages 6-7 of these notes from MathCentre discuss rounding a decimal to a certain number of decimal places or significant figures. There are also exercises on page 7 with answers at the end of the document.

A pdf of this document can be downloaded here.

### Interactive Exercises

This NUMBAS exercise lets you practise rounding numbers to various degrees of accuracy.

Please click here to view this NUMBAS question in another window.

### Scientific Notation

### Video

This video from *Khan Academy* shows you how to write a given number in decimal representation as one in scientific notation, and vice versa. This covers writing both large and small numbers.

Note: All *Khan Academy* content is available for free at www.khanacademy.org.

This video from *Krista King* describes division of numbers written in scientific notation, as well as converting an example of division in decimal notation to one in scientific notation.

Note: All *Krista King* content is available for free at www.youtube.com/c/Integralcalc.

Krista King’s Website: www.kristakingmath.com .

### Notes

These notes from MathCentre discuss the ideas behind scientific notation, give some examples, and have instructions on using your calculator when dealing with scientific notation.

A pdf of this document can be downloaded here.

### Interactive Exercises

These NUMBAS exercises from TEAM-E let you get some practice converting from decimal to scientific notation and vice versa, and also multiplying and dividing numbers written in scientific notation.

Please click here to view this NUMBAS question in another window.

Please click here to view this NUMBAS question in another window.