Maths

Rounding to 1 and 2 decimal

If the number is 5 or above it rounds up

2 decimal places you look at the 3rd number after the decimal place

If the last number is 4 or below it rounds fown

Rounding to whole number

Significant number

2nd significant number is the second number

etc

First significant number is the first number

Anything bigger than 0.5 goes up

Anything before 0.5 goes down

Estimating calculations

Estimate =not exact but close enough that you can do in head

You can estimate by rounding

Equation on a line

Gradient of a line :

Gradient

m=gradient

c=y intercept

y=mx+c

y Divide x

Y2-Y1 divided by x2-x1

rise divided by run

If line go down=negative

If line goes up=positive

Solving equations

Inequalities' :

Sequences :

7,12,17,22

Difference of 5

5n+2

Need to simplify so one side is x

< smaller than

bigger than=>

If there is a line under the symbol its equal

On a number line if the dot is shaded in it may be equal

If hollow it is not equal to