1. Backtracking with addition and subtraction

2. Do subtract 3 and then do add 3
Backtracking is when we do an addition or subtraction and then reverse it
Do subtract and then do add 3
Do add and then do subtract 5
Do add and then do subtract 2
Do subtract and then do add 8

3. Let's see these examples on a number line

4. Do subtract 3 and then do add 3

5. Do add 5 and then do subtract 5

6. Do add 2 and then do subtract 2

7. Do subtract 8 and then do add 8

8. With the full equation

9. The reverse operation of addition is subtraction.
Backtracking Rule
When we add or subtract one new number from an original number, we can reverse that calculation by performing the reverse operation with the new number.
The reverse operation of addition is subtraction.
The reverse operation of subtraction is addition.
Examples
3 + 2 = then by backtracking – 2 = 3
7 – 4 = then by backtracking = 7

10. Recap We do
_ + 3 = 9 _ - 5 = _ + 0 = 2
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _
_ + 0 = _ - 7 = _ - 5 = 32
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _
_ + 17 = 27 _ - 5 = 14
_ _ _ _ _ _ _ _ _ _

11. Finished