Numbers
At noon, the temperature was 21ºC.
At midnight the temperature had fallen by 26ºC
Find the temperature at midnight.
-5ºC
Earth has a surface area of approximately 510 100 000 km2
Water covers 70.8%
What is the area of the Earth’s surface covered by water
361 150 800 km2
Simplify 3a + 7b - 4a + b
-a + 8b
There’s a bag containing 10 red balls and 8 blue balls
A student takes one ball at random
What is the probability she takes a red ball
5/9
Temperature at 0700 is -3ºC.
This temperature is 11ºC higher than the temperature at 0100
What was the temperature at 0100
-14ºC
In 2018, Donald earned $32 000
She paid tax of 24% on these earnings
Work out the amount she paid in tax
$7680
Find the value of 7c + 3y when x = 12 and y = -6
66
These are the test scores of 14 students:
21, 21, 23, 26, 25, 21, 22, 20, 21, 23, 23, 27, 24, 21
A student is chosen at random
What is the probability that the student gets higher than 24
3/14
Insert one pair of brackets to make this calculation correct.
7 - 5 - 3 + 4 = 9
7 - (5 - 3) + 4 = 9
In a sale the original prices are reduced by 15%
Calculate the sale price of a book that has an original price of $12
$10.2
Y = mx + c
Find the value of y when m = -3, x = -2 and c = -8
Y = -2
Pluto plants some seeds
When a seed produces flowers, the probability that the flowers are red is 0.6 and the probability that the flowers are yellow is 0.3
Pluto has a seed that produces flowers
Find the probability that the flowers are not red and not yellow
0.1
Write down a cube number that is greater than 50 but less than 100
64
Manjeet uses 220 litres of water each day.
She reduces the amount of water she uses by 15%
Calculate the number of litres of water she now uses each day
187 litres
When 5x = 15, 12x =
36
These are the mass of 11 parcels:
24, 23, 23, 26, 25, 27, 18, 96, 16, 17, 32
Find the mode
Why √3 is not rational?
It cannot be written as a fraction
Cost of a ticket is reduced from $114 to $96.90
Calculate the percentage reduction in the cost of a ticket
15%
Y = x4 - 4x3
When x = -1 what is y
Y = 5
These are the mass of 11 parcels:
24, 23, 23, 26, 25, 27, 18, 96, 16, 17, 32
Find the mean
Bonus: why mean isn’t suitable
29.7