## Simple Addition and Subtraction A different Perspective

**Step 1: **You can introduce this as a puzzle activity in class and break the class into pairs so that they can brainstorm the puzzles you will be giving to them

**Step 2:** begin writing on the blackboard following sum

2+5= ?

Let the kids answer the question

2+5=**7 (ans)**

Rewrite the same sum again:

2+ ?= 7

Now again ask children what wud be the answer for this

They wud obviously say it aloud-** 5**

The catch is you need to ask them **why did they arrive at 5 as the answer- in case they are unable to answer then you need to give a fresh question**

Now give them a situation where numbers become objects

For example: There s a bag n which there are a total of 6 balls

As symbols write on the Blackboard-

**? balls+? balls= 6 balls**

Now tell them you** took out** two balls from the bag. Ask them where will you put the number ‘2’ on the sum written above

**2 balls +? balls= 6 balls**

Now ask them the next question- How many balls are left in the bag?

Answer from the children will be **4balls**

**2 balls +4 balls= 6 balls**

**Brainstorming question: What did you do to get the answer 4?**

**and Why did you do that operation?**

Explain the logic: Now rewrite the statement as:

2balls + ?balls = 6balls

So to find out how many are left in the bag, we can minus

? balls= 6 balls -2balls

### NOTE: The emphasis has to be on the word **‘took out’** that means we are using the operation subtracting

Now give them another example with a bigger numbers

Eg: 15 balls+ ?balls =2 7balls

Give them five mins to discuss n come out with a solution. In case they are not able to get the right answer then you can go ahead explaining the logic* again
*

*Give them more simple sums to solve using addition sign. Once they are clear with addition sign change the sums with’ -‘ signs*

Some complex examples are given below. These can be used as brain teasers and help the children solve