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Unit 1 Decimals & Fractions

Learn multiplying, dividing, converting fractions to decimals, dealing with negative numbers, and estimating answers.

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Unit 1 Decimals & Fractions

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  1. Unit 1Decimals & Fractions

  2. Unit 1Decimals & Fractions Multiplying and Dividing Decimals

  3. To multiply by 100, move the decimal point 2 places to the right, giving: similarly

  4. To divide by 100, move the decimal point 2 places to the left, giving: similarly

  5. You have finished viewing the presentationMultiplying and Dividing DecimalsPlease choose an option

  6. Unit 1Decimals & Fractions Converting Fractions and Decimals

  7. Fractions to Decimals Express as a decimal. Here it is best to divide out:

  8. Express as a decimal. Here it is easier to make the denominator a multiple of 10

  9. Express as a decimal in its simplest form

  10. You have finished viewing the presentationConverting Fractions and DecimalsPlease choose an option

  11. Unit 1Decimals & Fractions Negative Numbers

  12. Example 1 What is 15oC less than 26oC? Solution 26oC – 15oC = 11oC Example 2 What is 15oC less than 10oC? Solution 10oC – 15oC = – 5oC

  13. You have finished viewing the presentationNegative NumbersPlease choose an option

  14. Unit 1Decimals & Fractions Operations with Negative Numbers

  15. Remember … Example 1

  16. Remember … Example 2

  17. Remember … Example 3

  18. Remember … Example 4

  19. You have finished viewing the presentationOperations with Negative NumbersPlease choose an option

  20. Unit 1Decimals & Fractions Estimating Answers

  21. It is important to be able to estimate answers to complex calculations. Without a calculator which of the answers is equal to ? B 16∙494 C 164∙945 A 1∙649

  22. So the answer is . Without a calculator which of the answers is equal to ? You have to approximate each answer in the calculation. Hence, for example C B 16∙494 C 164∙945 A 1∙649

  23. You have finished viewing the presentationEstimating AnswersPlease choose an option

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