Maths random
What is the probability of getting heads when I flip a fair coin?
50%, 0.5, 1/2, or Evens
30 x 6 =
180
1/2 + 1/4 + 1/8
7/8
What is the acronym for order of operations?
BOMDAS
Mental Maths
330x3=
990
What is the formula for the area of a triangle?
1/2 x the base x the height
8 x 6 - 9 x 3 =
21
3/4 of 32
24
270 degrees
Mental Maths
2500 subtract 130 =
2370
How do I work out the range of a dataset?
highest score - lowest score
(72 + 1) divided by 2 =
25
2/3 + 4/9
10/9 or 1 1/9
What is the volume of a rectangular prism if the height is 5cm the length is 6cm and the width is 2cm
V = 60cm3
Mental Maths
327-195 =
132
formula = 9-2x180
= 1260 degrees
99 + 99 + 99 + 99 + 99 =
495
Mina's pool holds 120L of water. Each summer she needs to replace 3/5 of the water with new water. How much water does Mina need to replace?
1/5 of 120 = 24
24x3 = 72
answer: 72 litres of water
Order these in ascending order: 90%, 8/10, 0.1, 25%, 0.33
0.1, 25%, 0.33, 8/10, 90%
Mental Maths
12-13-4-5 =
-10
50 × (2 + 6) – 4 =
396
5 x (a + 6) = 40
What is a?
a = 2
Miss Smee had 48 highlighters. Miss Cheak had half the amount of highlighters that Miss Smee had. Miss Ford had two eights of the highlighters that Miss Smee had. How many highlighters did they have altogether?
12+24+48 = 84 highlighters
order these in descending order: -1/2, 5, -4/5, 0, 12, 3
-4/5, -1/2, 0, 3, 5 12
Jack and Jill bought 20 pencils each. Each pencil cost 20 cents. How much did it cost them altogether in dollars.
$4