1. Cut strips of graph paper with positive integers from 1 to 10 written left to right and negative integers from -1 to -10 written right to left. 2. Paste the strips on either side of a line drawn on a sheet with the negative integers on the left and positive on the right meeting in the middle. 3. To add, move right along the number line and to subtract, move left, with examples given of adding 2 to 3 and subtracting 4 from 5.

15. integers (including 0) from left to right on the
squares .
2) Take a green graph paper and again cut a
strip of 10 squares from it. Start writing
negative integers from right to left on the
squares.
3) Place a sheet on a table and draw a long
line. Mark a point in the middle of the line and
to the right side of that point, paste the pink
graph strip of positive integers and to the left
side, paste the green graph strip of negative
integers. Make sure that both the strips are
attached to each other.

16. 4) If we wish to add a number, we will move to the right side and if we
wish to subtract a number, we will move to the left side.
A) To show 2 more than 3
Since we want to add, we will move to the right side. In the given
example, we wish to add 2 to3. So, place the marker on 3 and move 2
steps to the right. The marker will be on 5.
b) To show 4 less than 5
Since we want to subtract, we will move to the left side. In the given
example, we wish to subtract 4 from 5. So, place the marker on 5 and
move 4 steps to the left. The marker will be on 1.
c) To show 3 more than -5
Since we want to add, we will move to the right side. In the given
example, we wish to add 3 to -5. So, place the marker on -5 and move 3
steps to the right. The marker will be on -2.