# Unit 3 Edexcel Maths notes for Chapter 1 and 2

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- Created by: Former Member
- Created on: 02-03-13 20:48

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UNIT 3 EDEXCEL MATHS HIGHER March 2, 2013

Notes for Chapter 1 and 2

Chapter 1 Numbers:

1. Using a calculator

You must have a scientific calculator to work out arithmetic calculations

When there are complicated numbers shown after a calculation do not round your numbers

part way through a calculation; use all figures shown on your calculator. Only round the final

answer.

Reciprocal of a number n is 1/n which we can write in the calculator as n-1 by using the x-1

key on your calculator.

2. Number problems

This comes in the exams as mostly like the worded question so you should read the

questions carefully

If you didn't understand it the first time don't just move on read it again and again

Sometimes it is use to rewrite the information is give in order for you to do your

calculations.

These problems could involve fractions or decimals or both.

This also include proportion so you must know that it is direct proportion when both

quantities are increasing or decreasing at the same rate

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