Computation Operations for Class 3

Computation Operations

The fundamental operations used to calculate values are computations. The computation operations include addition, subtraction, multiplication and division.

Addition

The process of addition involves combining two or more numbers to find their sum. The plus sign (+) is used to represent addition.

For example,

The addition of 529 and 213 is show as:

Thus, 529 + 213 = 742

Subtraction

Subtraction is the act of calculating the difference between two quantities, or integers. The subtraction symbol is "−" often known as the minus sign.

For example,

The subtraction of 529 and 213 is shown as:

Thus, 529 − 213 = 316

Multiplication

Multiplication is used to find the product of two or more numbers. The symbol used for multiplication is ‘×’.

For example, one car has 4 wheels.

So, 3 cars have 4 + 4 + 4 = 12

= 4 × 3 = 12 wheels.

The multiplication of 45 and 23 is shown as:

Thus, 45 × 23 = 1035

Division

Division is the process of dividing a number into equal parts and determining how many of those parts there are in total. The symbol used for division is '÷'.

For example, There are 20 balls to be put equally in 4 bags.

The arrangements can be made like this:

This is expressed as 20 ÷ 4 = 5.

Here, 5 balls can be put in each bag

Here, 20 is the Dividend, 4 is the Divisor, 5 is the quotient and 0 is the remainder.

Divide 930 by 15 is shown as:

Thus, 930 ÷ 15 = 62

Example:Which mathematical operator in the blank is used to make the given expression true?

982 _______ 492 = 490

a) +
b) −
c) ÷
d) ×

Answer: b) −

Explanation: Themathematical operator is used:

982− 492 = 490

Example: 25 buses are carrying 600 passengers. Each bus contains an equal number of passengers. How many people does a bus carry?

a) 22
b) 24
c) 32
d) 34

Answer: b) 24

Explanation: Number of buses = 25
Total number of passengers = 600
Number of passengers in a bus = 600 ÷ 25 = 24