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Negative numbers are used in the making of glasses to CHAPTER
correct eyesight problems. Get information from valid
sources such as conducting interviews with an optician,
referring to reading materials or exploring other suitable
sources. Write a report to explain how negative numbers
are used in making the lenses of glasses.

Do you know that positive and negative numbers can be generated using a spreadsheet
program? Follow the steps as follows to generate a particular list of numbers.

1. Run a suitable spreadsheet program.

2. Type –6 into cell A1, as shown in the diagram.
3. Select cell A2 and type =A1-2.

4. Select cell A2 and drag the fill handle at the lower right corner down.
Describe what you observe.
5. Select cell B1 and type =A1+8.

6. Select cell B1 and drag the fill handle at the lower right corner to the right.
Describe what you observe.

7. Change the number in cell A1 to another number.
Describe what you observe.
8. Explain how you can generate other lists of numbers.

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Rational Numbers

01 TB Math F1.indd 29 10/20/16 11:55 AM