maths

Distance Chart

Multiples of 10

Multiplication table of a number 10,20,30 etc

Factors of 10

Numbers that make up a number 1×10,2×5

Prime number

A number that has only 2 factors: 1 and itself e.g. 2,3,5,7,11

Calculate the area of a triangle. Base 3cm, Height 4cm

6cm squared

Diameter, radius and circumference

Interior angles of a pentagon (5 sided shape) add up to how many degrees?

540 degrees

What is the formula for experimental or relative frequency?

= number of success divided by number of trials

Formula for circumference of a Circle

C= Pi D

Formula for Area of a circle

A= Pi r squared

How to calculate the mean from a grouped frequency chart

For each row, multiply the values by the frequency to get a total. Divide the total by the frequency.

What can you simplify when adding and subtracting in algebra?

Group same letters, and group numbers (imagine objects on the table)

What can you simplify when multiplying and dividing in algebra?

you can combine letters, combine numbers, and combine powers (like putting it all in a blender)

How do you rearrange formula to make another letter the subject. e.g. make w the subject: y = 3w - a

Cancel out by doing the opposite to remove everything leaving the letter you want. 

e.g. w = (y+a)÷3

What are the rules for +/- with negative and positive numbers e.g. -4 -6 and -4 + 6

if the sign is the same: keep the sign and add the numbers e.g. answers -10 and +2

What are the rules for multiply and divide negative and positive numbers e.g. -4 x -6 and -4 × 6 

if the sign is the same the answer will be positive answers = 24 and -24

How do you work out the mean average? e.g. 2 3 4 4 4 5 6 6 7 7 

Add up all the numbers and divide by how many numbers there are. Answer = 4.8

How do you work out the median number? e.g. 2 3 4 4 4 5 6 6 7 7 

Rank them in order and find the middle number (if it’s 2 numbers in the middle, find half way) Answer = (4,5) 9÷2=4.5

How do you work out the Mode?

e.g. 2 3 4 4 4 5 6 6 7 7 

Find the most common number that occurs. Answer = 4 (comes up 3 times)

How do you work out the range?

e.g. 2 3 4 4 4 5 6 6 7 7 

Rank them and take the smallest away from the biggest. Answer = 7-2 = 5