Subtraction Using Number Line
Subtraction Using Number Line
Number Line:
A horizontal line that has divisions marked at equal intervals. The marking on a scale represent number line.Steps to find difference of two numbers using number line:
To find the difference of two numbers using a number line we will follow the following steps
1. We will draw an arc covering the number of divisions equal to the first number.
2. Then from the ending point of the first arc we will draw an arc in the backward direction covering the number of divisions equal to the second number.
3. The end point of the second arc shows the difference of two numbers.
In the figure below shows the subtraction of 9 - 3 on a number line The first arc covers 9 divisions as the first number is 9. The second arc starts from the endpoint of the first arc in the backward direction and covers 3 divisions as the second number is 3. The end point of the second arc is at 6. So on subtracting 3 from 9 we get 6.
So we can say that
9 divisions minus 3 divisions is equal to 6 divisions.
Similarly
8 divisions minus 5 division is equal to 3 divisions.
The first arc covers 8 divisions as the first number is 8. The second arc starts from the endpoint of the first arc in the backward direction and covers 5 division as the second number is 5. The end point of the second arc is at 3. So on subtracting 5 from 8 we get 3.
Illustration 1: Fill in the blank.
A. 3 B. 9 C. 2 D 4
Answer: B
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