Table of Contents
Basic Math Operations
In basic mathematics, there are many ways of saying the same thing:
| Symbol | Definitions |
| + | Addition, Add, Increase, Plus, Sum, Total |
| − | Decrease, Deduct, Difference, Less, Minus, Subtraction, Subtract, Take Away |
| × | Multiplication, Multiply, Times, Product, By, Lots Of |
| ÷ | Division, Divide, Goes Into, How Many Times, Quotient |
Addition
Addition is bringing two or more numbers (or things) together to make a new total. The numbers to be added together are called the “Addends”:
4 + 7 = 11
where:
4 and 7 are called addends
11 is called Sum
Subtraction
Subtraction is taking one number away from another. In subtraction, there are 3 words to remember.
Minuend :The number that is to be subtracted from.
Subtrahend :The number that is to be subtracted.
Difference : The result of subtracting one number from another.
So, subtraction is
Minuend − Subtrahend = Difference
7 – 4 = 3
where:
7 is the minuend
4 is the subtrahend
3 is the difference
Multiplication
Multiplication is repeated addition.
4 + 4 + 4 + 4 + 4 + 4 + 4 (seven 4s) make 28
4 x 7 = 28
It can also be said that 7 + 7 + 7 + 7 (four 7s) make 28
Division
Division is splitting into equal parts or groups. It is the result of fair sharing.
Division has special words to remember.
Let’s take the simple question of 7 divided by 4. The answer is 1, with 3 left over.
7 ÷ 4 = 1 R 3
where:
7 is the dividend
4 is the divisor
1 is the quotient
3 is the remainder
Fraction
A Fraction is part of a whole. Fraction has 2 parts, they are numerator (top) and denominator (bottom).
The numerator says how many parts we have.
The denominator says how many parts the whole is divided into.
4/7
where:
4 is the numerator
7 is the denominator
Decimal
A Decimal Number is a number that contains a Decimal Point.
12.345
where:
1: tens
2: ones
Symbol “.” is the decimal point
3: tenths
4: hundreds
5: thousands
Percentage
A is parts per 100. The symbol of percentage is %
45% means 45 per 100
Average (Mean)
Average is the sum divided by the count.
How to find average?
- adding up all the values
- divide by how many values
What is the average of 1, 2, 3, and 4?
Step 1 : 1 + 2 + 3 + 4 = 10
Step 2 : 10 ÷ 4 = 2.5
So the average is 2.5