Maths and Logic

Maths and logic
Discrete maths is data with certain values, e.g if you had to half a class of 17 students you can’t cut a person in half
Continuous maths is data with any values, e.g a person height could be any value and not just a certain value.

Number Types

25/9/19-Recap of maths, addition, multiplication, division and subtracting
Used and recap of Bidmas
Learnt binary conversion.

Binary only uses number 0-1, the number 00100101 represents 37. Binary acts as an on and off switch on being shown as 1 and off being 0 so a table of 8 like
|128|64|32|16| 8 | 4 | 2 | 1 |
0 0 1 0 0 1 0 1
can be shown as 37 since only the numbers with 1 are “on”.

Denary uses the number 0-9 and is our basic counting number system
0 ,1 ,2 ,3 ,4 ,5 ,6 ,7 ,8 ,9.

Hexadecimal uses 16 numbers 0-F
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F
A= 10, B= 11, C= 12, D= 13, E= 14, F= 15.
Denary can be converted into hex like the number 166 = A6.
A = How many times 16 goes into 166, 10 and the remainder 6 which gives us A6.
|x*16| |y*1| –> Hex to Denary.
X = X/16= X remainder = Y Denary to Hex.

We learnt about/ recapped the averages, Mean, Medium, Mode and Range.
Mean – All the numbers added together divided by the amount of number.

Medium – Put all the numbers in order of size, smallest to largest and then the answer is the middle number.

Mode – The most common number, the number that appears the most.

Range – The biggest number subtracted by the smallest number.

Matrices
Matrices are a rectangle array sorted in rows and columns.
You can add and subtract matrices easily, 0,0 + 0,0 and 0,1 + 0,1 and 1,0 + 1,0 finally 1,1 + 1,1.