Introduction of Subtraction with its sign –

Siddharth Yadav
40mins
Problem Solving
Remember, Understand, Application

Introduction of Subtraction with its sign –
-To teach children the concept of subtraction using the symbol- Make them practice in class various examples using symbol (-)
The children in previous class were introduced to the concept of subtraction is 'Take away/ give away' now this concept will be crystalized using the symbol of minus so that children can then be taken to solve more complicated problems in future
chalks ,blackboard

Step 1: We begin the class with drawing pictures of flowers/ balloons or toffees on the blackboard and revise with children the Strike out method.

Image result for image of toffeeImage result for image of toffee Image result for image of toffee Image result for image of toffeeImage result for image of toffeeImage result for image of toffeeImage result for image of toffee(7)    For example 7 toffee are drawn on the BB.

Image result for image of toffee       Image result for image of toffee       (2)      Teacher strikes out two. Then ask children how many are left.

Step 2: Now tell them we will change the strike out line to a horizontal line and re write the same toffee example as shown below:

Image result for image of toffeeImage result for image of toffeeImage result for image of toffeeImage result for image of toffeeImage result for image of toffeeImage result for image of toffeeImage result for image of toffee (7)

        –

Image result for image of toffeeImage result for image of toffee (2)

=

Image result for image of toffeeImage result for image of toffeeImage result for image of toffeeImage result for image of toffeeImage result for image of toffee

To solve this ask children to again strike out 2 from seven toffees. Once you strike off two toffees tell them those cancelled out 2 toffees are the two toffees written after the minus sign

Now make them count the remaining toffees which are left after cutting off two coffees.

Step 3: keep doing this exercise with other examples for children to understand and this time keep asking questions to them like how many number of toffees/ candies/ flowers need to be cut off etc…

When you repeatedly do this exercise children become familiar with the idea of subtraction and understand the new methodology which is being introduced to them.

You can give them practice sheets in class as well as home work to practice this methodology

Click on this link for more examples:

http://www.worksheetfun.com/category/math-worksheetfunmenu/subtraction/picture-subtraction/

 

 

 

http://www.worksheetfun.com/subtraction/picturesubtractionbox1.pdf
http://www.worksheetfun.com/subtraction/picturesubtractionbox2.pdf
http://www.worksheetfun.com/subtraction/picturesubtractionbox4.pdf
Ask repeat questions like how many left while doing the activity on the blackboard.
Accurate, Clearly explained, Knowledgeable, Precise

Children require lot of hand holding when teaching new concepts. So its best if you keep practicing the new concepts in different ways but go step by step and don't lose patience

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