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# Complex arithmetic resources

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### 3GP Mobile Phone (8)

This mobile phone video explains how complex numbers can be added or subtracted. There is an accompanying leaflet. Sigma resource Unit 4. This resource is released under a Creative Commons license Attribution-Non-Commercial-No Derivative Works and the copyright is held by mathcentre.
Division of complex numbers
This mobile phone video explains how to divide complex numbers. Sigma resource Unit 7. This resource is released under a Creative Commons license Attribution-Non-Commercial-No Derivative Works and the copyright is held by mathcentre.
This mobile phone video shows how the imaginary number i can be used in the solution of some quadratic equations. Sigma resource Unit 2. This resource is released under a Creative Commons license Attribution-Non-Commercial-No Derivative Works and the copyright is held by mathcentre.
Motivating the study of complex numbers
This mobile phone download introduces complex numbers by explaining how it is useful to be able to formally write down the square root of a negative number. Sigma resource Unit 1. This resource is released under a Creative Commons license Attribution-Non-Commercial-No Derivative Works and the copyright is held by mathcentre.
Multiplying complex numbers
This mobile phone video explains how complex numbers can be multiplied together. There is an accompanying leaflet. Sigma resource Unit 5. This resource is released under a Creative Commons license Attribution-Non-Commercial-No Derivative Works and the copyright is held by mathcentre.
The complex conjugate
This mobile phone video explains what is meant by the complex conjugate of a complex number. Sigma resource Unit 6. This resource is released under a Creative Commons license Attribution-Non-Commercial-No Derivative Works and the copyright is held by mathcentre.
The polar form of a complex number
This mobile phone video explains what is meant by the polar form of a complex number. Sigma resource Unit 10. This resource is released under a Creative Commons license Attribution-Non-Commercial-No Derivative Works and the copyright is held by mathcentre.
What is a complex number
This mobile phone video explains what is meant by a complex number, and how to find its real and imaginary parts. Sigma resource Unit 3. This resource is released under a Creative Commons license Attribution-Non-Commercial-No Derivative Works and the copyright is held by mathcentre.

### Guides (1)

Just the Maths (A.J.Hobson)
"Just the Maths" authored by the late Tony Hobson, former Senior Lecturer in Mathematics of the School of Mathematical and Information Sciences at Coventry University, is a collection of separate mathematics units, in chronological topic-order, intended for foundation level and first year degree level in higher education where mathematics is a service discipline e.g. engineering.

### Quick Reference (9)

This leaflet explains how complex numbers can be added or subtracted. There are accompanying videos. Sigma resource Unit 4.
Complex arithmetic
This leaflet explains how complex numbers can added, subtracted, multiplied and divided. (Engineering Maths First Aid Kit 7.2)
Division of complex numbers
This leaflet explains how to divide complex numbers. Sigma resource Unit 7. There are accompanying videos.
This leaflet shows how the imaginary number i can be used in the solution of some quadratic equations. Sigma resource Unit 2.
Motivating the study of complex numbers
This unit introduces complex numbers by explaining how it is useful to be able to formally write down the square root of a negative number. Sigma resource Unit 1.
Multiplying complex numbers
This leaflet explains how complex numbers can be multiplied together. There are accompanying videos. Sigma resource Unit 5.
The complex conjugate
This leaflet explains what is meant by the complex conjugate of a complex number. There are accompanying videos. Sigma resource Unit 6.
What is a complex number
This leaflet explains what is meant by a complex number, and how to find its real and imaginary parts. Sigma resource Unit 3.
What is a complex number ?
This leaflet gives a simple, brief introduction to the concept of a complex number. (Engineering Maths First Aid Kit 7.1)

### Test Yourself (5)

Basic complex numbers - Numbas
6 questions on complex numbers, multiplication, inverse, division and modulus. Finding the distance between complex numbers. Numbas resources have been made available under a Creative Commons licence by Bill Foster and Christian Perfect, School of Mathematics & Statistics at Newcastle University.
Complex Numbers Arithmetic - Numbas
6 questions on complex numbers, multiplication, inverse, division and modulus and finding the distance between complex numbers. Numbas resources have been made available under a Creative Commons licence by the School of Mathematics & Statistics at Newcastle University.
Complex Numbers Test 01 (DEWIS)
Seven questions on complex numbers. Testing modulus, multiplication, division, Argand diagram, polar form, De Moivre's theorem. DEWIS resources have been made available under a Creative Commons licence by Rhys Gwynllyw & Karen Henderson, University of the West of England, Bristol.
Maths EG
Computer-aided assessment of maths, stats and numeracy from GCSE to undergraduate level 2. These resources have been made available under a Creative Common licence by Martin Greenhow and Abdulrahman Kamavi, Brunel University.
Modulus and argument - Numbas
Find the modulus and argument of complex numbers. One question. Numbas resources have been made available under a Creative Commons licence by Bill Foster and Christian Perfect, School of Mathematics & Statistics at Newcastle University.