Example 1
0 + 3
we begin at 0 and move 3 units to the right as shown below in red to get +3,
Also + 4 + 3 we stand at +4 then move 3 units to the right as shown in blue to get +7.
Example 2
0 - 3
we begin at 0 move 3 units to the left as shown in red below to get -3
while (-2) + (-3)
we open the brackets to get -2 - 3
then stand at -2 on the number line then move 3 steps to the left as
shown in blue to get -5.
Example 3
(+7) – (+5) =
first remove the brackets to get 7 - 5
stand on +7 on the number line then move 5 steps to the left as shown in blue below
that takes you to 2.
The answer is therefore 2.