section 4

Question 1

what are rational numbers?

Answer 1

integers
fractions
recurring decimals

Question 2

what are irrational numbers?

Answer 2

surds

can’t be written as fractions

Question 3

is 1 a prime number?

Answer 3

NO

Question 4

how do you find the least common multiple - LCM?

Answer 4

list all the multipliers of both numbers and find the smallest on both lists

Question 5

how do you find the highest common factor - HCF?

Answer 5

list the factors of both numbers and find the biggest in each list.

Question 6

what are multiples of a number?

Answer 6

it’s time table

Question 7

what are the factors of a number?

Answer 7

numbers that will divide into the number

Question 8

how do you convert s fraction into a decimal?

Answer 8

divide the top by the bottom

Question 9

how would you turn a decimal to a percentage?

Answer 9

X 100

Question 10

what do you do when you multiply the powers?

Answer 10

you add them

Question 11

dividing the powers?

Answer 11

subtract them

Question 12

powers in and out of brackets?

Answer 12

multiply them

Question 13

what would something to the power of 1 be?

Answer 13

that number

Question 14

what is anything to the power of 0?

Answer 14

1

Question 15

what would you do if the power was outside the bracket of a fraction?

Answer 15

apply the power to the bottom and top of the fraction

Question 16

what do you do with negative powers?

Answer 16

turn it upside down.

e.g. 7to the power of -2 would be 1 over 49

Question 17

if a power is in a fraction what does the bottom number mean? the top number? which do you do first?

Answer 17

the root of it
to the power of it
the ROOT

Question 18

how do you rationalise the denominator?

Answer 18

multiply the bottom number and the top number by the bottom surd

Question 19

what is the gradient?

Answer 19

change in Y divided by change in X

Question 20

how do you find the mid-point of an coordinates?

Answer 20

add the X of coordinates and Y of the coordinates and divide by 2

Question 21

what do the graph sin do?

Answer 21

pass through 0 to start and 90 is 1 and so on

Question 22

what is the cos graph?

Answer 22

starts with 1 and 0 equals 99 and so on

Question 23

how do you calculate the distance ins velocity time graph?

Answer 23

work out the area underneath

Question 24

how do you work out the are of a trapezium under a velocity time graph?

Answer 24

half X average of parallel sides X the distance

Question 25

what is the sum of exterior angles in a polygon?

Answer 25

360

Question 26

what is the sum of the interior angles?

Answer 26

number of sides of the polygon - 2 X 180

Question 27

how do you find the exterior angle in a regular polygon?

Answer 27

360 / number of sides

Question 28

how do you find the interior angles of a regular polygon?

Answer 28

180 - exterior angle

Question 29

what does the top number on a vector represent?
what happens if it’s a +
a - ?

Answer 29

the direction
left = a minus number
right = a plus number

Question 30

what does the bottom number in a column vector represent?
if it’s a minus?
a plus?

Answer 30

up or down
plus = up
minus = down

Question 31

how do you find the end probabilities on a tree diagram?

Answer 31

multiply the fractions together all along then branches

Question 32

how do you work out the surface area of a sphere?

Answer 32

4 X pie x radius squared

Question 33

how do you work out the curved surface area of a cone?

Answer 33

pie X radius Xlength

Question 34

what’s the area of a trapezium?

Answer 34

a half (a+b) X h

Question 35

area of a parallelogram?

Answer 35

base X height