discrete and continuos data
Discrete data is like a pair of shoes size 4 and 5 are ok but size 4.3 is no use, no in between numbers.
Continous data is like measurements. they have in between points 0.1 0.2
10% move one dp to the left
on a calculator number divided by 100 x 10%
Divide the interest by he amount of the loan (other money number) and then x by 100.
Lucy has aloan of £750 she pays interest of £25.50 per month. What is the rate of a simple interest.
£25.50 divide by £750 = 0.034
Then times 0.034 by 100
Percentage increase and decrease
% of an amount divided by 100 x amount =
There is a sle in top shop and your favourite jeans are 56% off they cost £20 originally
eg 4% of 920
4 divide by 100 x by 920
WORKING OUT THE PERCENTAGE RATE
Numberdivide by Number x 100- So the other way around!
Percentage Original Amount
If a dress cost £42 in the sale it was reduced by 15% what was the original price?
You need the whole information is 100%
Take the percentage you have been given away from 100 so in this example 100- 15% = 0.85
Divide the price or number by your percentage
42 divided by 0.85 = £49.41
The amount should be bigger!
2x+6 becomes 2(x+3)
2x-24 becomes 2(x-12)
6n-48 becomes 6(n-8)
3+3t becomes 3(1+t)
To find number of triangles in a ploygon shape - take 2 away from the number of sides in that shape
Sum of interior angles =
times the number of triangles by 180 degrees
sums of each interior and exterior angle
Sum of each exterior angle=
To find the size of each exterior angle, we divide the sum
of the interior angles by the number of sides. Then take
that number from 180 degrees.
Sum of each interior angle=
We divide the sum of interior angles by the number of
angles in the shape.
To work out the longest side
Square both of the other side seperatley anf then add them together
Then find square root
To work out the shortest side
the point of the right angle points to the shortest side
so square both of the sides seperatley but take away from each other
Then find sqaure root
Dividing Fractions and whole numbers
3 divide by 1/2
Make the whole number into a fraction with denominator as 1
the swap the other fraction around, so denominator becomes numerator
multiply your numbers then simplify if you can
3/1 x 2/1 = 6/1
Decimals to fractions, fractions to decimals
DECIMAL TO FRACTION:
0.6=6/10 0.4= 4/10 0.65= 65/100 0.875= 875/1000
FRACTIONS TO DECIMALS
Divide the numerator by the denominator (with a calculator) or multiply the fraction by 1.00 eg.
2/5x1.00= 2 x 1.00 = 2.00 = 0.40 or .04
5 x1.00 5
the 2.00 has been changed to 200 then dp added