# Maths Revision

maths revison to know what is what

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• Created by: sanny
• Created on: 30-04-12 19:45

## Averages and Range

Range – The range is the highest number subtract the lowest number.  Kieran's highest number is 13, and the lowest 8. Therefore, the range is 13 - 8 = 5.

Median – The median is the middle number but before you have to put them in order.

Mode – The mode is the one that occurs the most in the set of data. Have another look at Kieran's results and find the mode: 9 13 9 11 9 13 11 9 10 8 11

Mean – To calculate the mean, you have to first add up all the numbers together then divide by the amount of numbers.

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## Probability

Probability is about estimating how likely something is to happen.

certain, likely, very likely, evens (neither likely or unlikely), unlikely, very unlikely or impossible.

Example: Guess each one:

You buy a lottery ticket and win the jackpot.

You toss a coin and get heads.

Christmas will fall on 25 December this year.

You grow another nose.

It will rain in the first week of December.

Guess what is what.

Experimental Probability - You estimate probability from an experiment.

For an example, in an experiment where you drop a pin:

The pin lands up 279 times.

The pin lands down 721 times.

The total number of throws is 1000.

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## Fractions

How do  we find 3/5 of 20?

Method 1 is to find 1/5 of 20, then multiply by 3.

1/5 of 20 is 20 ÷ 5 = 4.

We need 3/5 of 20, so we multiply 4 by 3.

3/5 of 20 = 4 × 3 = 12.

Equivalent Fractions

A fraction can look and be written different but it still means the same thing.

This is call a Equivalent Fraction.

Examples:

3/5 is the same as 6/10

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Nice, simple reinforcement of the averages and range

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Needs more stuff if ur gonna call it "MATHS revision"

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