Maths Skills Flashcards
1
Q
How do you calc %?
A
x/ total × 100 = %
2
Q
Percentage increase calc
A
100 × (final- initial) ÷ initial
3
Q
Percentage decrease calc
A
-100 × (final- initial) ÷ initial
4
Q
Percentage -> decimal
A
Remove %
Move point x2 places left
E.g. 37% = 0.37
5
Q
Dwcimal -> fraction
A
If 2 d.p ÷ by 100
If 3 d.p. ÷ by 1000
Nō d.p. = Nō of Zeros
Simplify fraction
6
Q
Using ratios
A
Always reduce by finding lowest common multiple or LCM
7
Q
Math symbols
A
8
Q
Probability
A
Accepted level = 5%
=5% chance reults= by fluke= equal to or less
95%= due to change
9
Q
Significance levels
A
0.0091
To 2dp= 0.01
To 2 sf= 0.0091
10
Q
Order of magnitude
A
