1st Class Mathematics Subtraction

                                                                                                    Subtraction

Subtraction

Subtraction means taking out something from some bigger unit and finding the outcome as left over.

Subtraction of Two Numbers

It is the process of taking away smaller number from the greater one.

• Example:

           5 - 3 = 2

Subtraction of Figures

5 hours - 2 hours=3 hours

Trick:

Subtraction of Images

It means taking out picture or pictures from the group of pictures and finding the remaining as the result of the subtraction.

• Example:

Subtraction in Column

Subtraction in column is done by subtracting the numbers in column. See the examples given below:

• Example:

Word Problems Based on Subtraction

Like addition, word problems on subtraction are basically the statements, which require solution by means of subtraction only.

• Example:

James purchased 18 balloons on his birthday and gave 1 balloon to each of his friends. He has 7 friends. How many balloons are left with him?

(a) 11 balloons               (b) 10 balloons

(c) 12 balloons                (d) All the above

(e) None of these

Answer (a)

Explanation: Option (a) is correct because:

18 - 7 = 11  balloons.

Problems Based on Addition and Subtraction Both

In some questions you have to perform both addition and subtraction. See the examples given below:

• Example:

Solve the sum given below:

5 + 7 + 8 - 9

To solve this sum, first add the numbers with + sign. That is 5 + 7 + 8 = 20 Now subtract 9 from 20. That is 20-9=11. So the answer is 11.