Step1: Introduction of Subtraction as a concept
Begin the class with the introducing them to the idea of ‘ taking away/ giving away/ cutting’. Ask them simple questions which they can relate to in their life like:
- If you have two candies/ chocolates/ biscuits and you give away (दे दो) one (1) of it to your teacher/ mother/ friend then what happens? Do you have more ज्यादा candies left or less कम?
- Now repeat the same example by demonstrating it with beads/ blocks which you have.
a) Keep 4 blocks on the table. Now say ‘ I take away (ले लेती) 1 block from the table’ so do you think less कम blocks are left on the table.
b) Do this exercise a few more times with different numbers between (1-9) so that they are well versed with the concept of reduction.
c) Now repeat this same exercise on the blackboard, by drawing pictures of ice cream sticks/ ball/ flower.
Cut out 4 balls from here:
When you strike 4 balls then ask children to count the remaining ones. let them answer . Ask them again to repeat the statement in different ways-
Like: By striking away 4 balls we were left with 5 balls out of 9 balls
or out of 9 balls when 4 were struck off then 5 balls were left
or SO when we strike away the number decreases or reduces कम हो जाता है
Continue doing like this for next 10mins with a few more examples so that children are absolutely clear with the concept of cutting/ striking away leads to reduction in numbers
In the end you can give them practice sheets like given in the worksheet to be done at home.
In the next class introduce the concept of (-) to the children