maths exam prep

Question 1

Rectangle area

Answer 1

length x width

Question 2

Rectangle perimeter

Answer 2

2 x length + 2 x width

Question 3

Triangle area

Answer 3

1/2 base x height

Question 4

Triangle perimeter

Answer 4

add up all the sides

Question 5

parallelogram area

Answer 5

Base x height

Question 6

trapezium area

Answer 6

1/2 x height x sum of parallel sides

Question 7

Circle area

Answer 7

πr²

Question 8

Circle circumference

Answer 8

2πr

Question 9

Distance

Answer 9

speed x time

Question 10

Speed

Answer 10

distance/time

Question 11

Time

Answer 11

distance/speed

Question 12

Gradient of a graph

Answer 12

y/x

Question 13

Mean

Answer 13

total of values/ sum of values

Question 14

mode

Answer 14

Most frequent number

Question 15

median

Answer 15

Middle value when numbers are arranged in order of size

Question 16

Percent increase/decrease

Answer 16

(Actual change x 100)/ original

Question 17

Total degrees in polygon

Answer 17

(Number of sides -2) x 180

Question 18

Interior angle

Answer 18

Total degrees/number of sides

Question 19

Number of sides

Answer 19

360/exterior angle

Question 20

Sin angle =

Answer 20

opposite/hypotenuse

Question 21

Cos angle

Answer 21

Adjacent/ hypotenuse

Question 22

Tan angle

Answer 22

Opposite/adjacent

Question 23

arc length

Answer 23

(Angle/360) x 2πr

Question 24

Sector area

Answer 24

(angle/360) x πr²

Question 25

Simple interest formula

Answer 25

``` I = PRT/100 I is interest P is principal amount R is rate of interest T is time ```

Question 26

Compound interest formula

Answer 26

``` A= P = (1 + r/100)ⁿ P is amount invested r is the rate of interest n is number of years A is value of investment after n years ```

Question 27

Venn diagram formula

Answer 27

n( A U B) = n(A) + n(B) - n(A n B)

Question 28

Quadratic formula

Answer 28

x =( -b+-√b²-4ac) /(2a)

Question 29

Equation of linear graph

Answer 29

``` y = mx + c M = gradient and c = y intercept ```

Question 30

acceleration and deceleration =

Answer 30

Change in speed/time taken

Question 31

distance travelled =

Answer 31

Area under speed time graph

Question 32

volume of any prism =

Answer 32

Cross sectional area x length (or height)

Question 33

Curved surface area of cylinder =

Answer 33

2πrh

Question 34

Curved surface area of cone

Answer 34

πrl

Question 35

curve surface area of sphere

Answer 35

4π²

Question 36

Volume of pyramid

Answer 36

1/3 Ah

Question 37

Volume of cylinder

Answer 37

πr²h

Question 38

volume of cone

Answer 38

1/3πr²h

Question 39

Volume of sphere

Answer 39

4/3πr³