2) Addition, Subtraction and Multiplication on Number Line

Suppose you have a number line begining from, 0.

a) Addition of  whole number 2 and 3 give 2+3 = 5 so do we get 5 on number line let's see

              2                 3

       xxxxxxxxxxxxxxxxxx

<---|-----|-----|-----|----|----|-----|----|----|----|----|----|----|----|-----|-----|----------------------------------------->

      0     1      2     3    4     5      6     7    8      9    10   11   12   13   14   

In number line you begin calculation from 0. In subtraction 7-5 = 2 you start with 0 go to 7 and then reverse 5 from 7 you get 2 as answer on number line.

So this is the uniqueness of number line. That number line calculations begin with 0. In Multiplication same is the concept

4 x3 is 0 to 4 you jump 3 times and we get 12 number on number line. That is the answer.