# Addition, Subtraction and Multiplication of Algebraic Expressions

## Addition and Subtraction of Like Terms

## Video

This video from *Khan Academy* explains how to gather like terms and simplify an algebraic expression.

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

## Notes

These notes from HELM (pages 40-42) show how to add and subtract like terms in algebraic expressions. Try the exercises on page 43 to get more practice.

A pdf of this document can be downloaded here.

## Interactive Exercises

Practise collecting like terms with the following NUMBAS exercise.

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

## Multiplying Algebraic Expressions

## Videos

These two videos from *Maynooth University* explain how to multiply and expand algebraic expressions

Note: All *Maynooth University* content is available for free at msc.maths.nuim.ie.

Note: All *Maynooth University* content is available for free at msc.maths.nuim.ie.

## Notes

These notes from HELM (pages 44-51) show how to multiply algebraic expressions. Try the exercises on page 54 to practise what you have learned.

A pdf of this document can be downloaded here.

## Removing Brackets

## Videos

This video from *Maynooth University* explains how to remove brackets by expanding/multiplying out algebraic expressions.

Note: All *Maynooth University* content is available for free at msc.maths.nuim.ie.

## Notes

These notes from HELM (pages 44-51) show how to remove brackets from algebraic expressions. Try the exercises on page 54 to practise what you have learned.

A pdf of this document can be downloaded here.

## Interactive Exercises

Try these NUMBAS exercises for more practice removing brackets and multiplying algebraic expressions.

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