Rules Flashcards
What does BIDMAS mean?
Brackets, Indices, Division, Multiplication, Add, Subtract
How do you work out the mean?
Add up all the numbers and divide the total by the amount of numbers there are
How do you work out the range?
The difference between the highest and the lowest number
How do you work out the mode?
Find the number used most often
How do you work out median?
Put all of the numbers in order then find the middle number if there are two numbers add them together and divide by 2.
How do you work out the estimated mean?
First you must find the midpoint of all the numbers on the table, then times the frequency by the mid point (label that row Fx) Add all of numbers on the frequency table up and do the same with Fx row then divide the totals by each other to work out the estimated mean.
How do you convert pounds to other currencies?
Multiple the amount of British pounds by the exchange rate.
Example-£500 x $1.13= $565
How do you convert other currencies into pounds?
Divide the amount of other currency by exchange rate.
Example- $200/ $1.75= £114.29
What is a prime number?
A prime number is number with two factors (The number 1 and the number itself)
2,3,5,7,11,13,17,19,23,29,31
How do you work out speed?
Distance/ Time= Speed
How do you work out distance?
Speed x Time= Distance
How do you work out time?
Distance/ Speed= Time
How do you work out density?
Mass/ Volume= Density
How do you work out mass?
Volume x Density= Mass
How do you work out volume?
Mass/Density= Volume
How do you work out bearings?
Bearings are a measure of direction taken from North.
Bearings are always measured in a clockwise direction
Bearings are always written in 3 figures e.g. 85° is 085°
How can you work out the percentage of an amount?
Total/ 100 x % Amount
When would a number be negative?
If the signs are different it will make a negative number
When would the number positive?
If the signs are the same the number would be positive
How do you convert M to CM
Times M by 100
How do you convert CM to M
Divide CM by 100
How do you convert MM to CM
Times CM by 10
How do you convert CM to MM
Divide MM by 10
How do you convert M to MM
Times M by 1000
