Formulas/definitions

Question 1

Mode

Answer 1

Most common number

Question 2

Mean

Answer 2

add all numbers together then divide by amount of numbers

Question 3

Median

Answer 3

put numbers in size order (smallest to largest) - number in the middle

Question 4

Range

Answer 4

difference between highest and lowest number

Question 5

Circumference

Answer 5

Pi x Diameter

Question 6

Area of circle

Answer 6

Pi x radius squared (pi x r x r)

Question 7

Diameter

Answer 7

= 2 x radius

Question 8

Radius

Answer 8

= 1/2 of diameter

Question 9

BIDMAS

Answer 9

Brackets
Indices
Division
Multiplication
Addition
Subtraction

Question 10

Area of triangle

Answer 10

base x height / 2

Question 11

Area of rectangle

Answer 11

width x length

Question 12

% Change Formula

Answer 12

new value minus original value divided by original value x 100%

Question 13

% increase formula

Answer 13

X% divided by 100 x original value = Answer ADD original value = Final Answer

Question 14

% decrease

Answer 14

e.g. 180,000 decrease of 4%
180,000 x 4% = 7200
180,000 - 7200 = 172,800

OR think 180,000 = 100%
100 - 4 = 96%
180,000 x 96% = 172800

Question 15

volume of cuboid / rectangle / square box

Answer 15

height x width x depth (cm3)

Question 16

volume of cylinder

Answer 16

= pi x r2 (rxr) x height

Question 17

Volume of cone

Answer 17

as cylinder = pi x r2 (rxr) x height divided by 3