Subtracting Integers on a Number Line
With the help of number line we can subtract integers.
It is better to show on examples how to do this.
Example 1. Find -1-4.
We draw -1 on a number line. Since we subtract positive number (4) we move 4 units to the left. Result is -5. So, -1-4=-5.
Answer: -5.
Let's see how to subtract negative numbers.
Example 2. Find -1-(-6).
We draw -1 on a number line. Since we subtract negative number (-6) we move 6 units to the right. Result is 5. So, -1-(-6)=5.
Answer: 5.
Now, do the following exercise to remember this topic better.
Exercise 1. Find 4-8.
Answer: -4.
Next exercise.
Exercise 2. Find 1-(-1).
Answer: 2.