Download - Math unit1 decimals and fractions
Unit 1Decimals & Fractions
Presentation 1 Multiplying and Dividing Decimals
Presentation 2 Converting Fractions and Decimals
Presentation 3 Negative Numbers
Presentation 4 Operations with Negative Numbers
Presentation 5 Estimating Answers
Unit 1Decimals & Fractions
Multiplying and Dividing Decimals
To multiply by 100, move the decimal point 2 places to the right, giving:
similarly
To divide by 100, move the decimal point 2 places to the left, giving:
similarly
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Multiplying and Dividing Decimals
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Presentation 2 Converting Fractions and Decimals
Presentation 3 Negative Numbers
Presentation 4 Operations with Negative Numbers
Presentation 5 Estimating Answers
Unit 1Decimals & FractionsConverting Fractions and
Decimals
Fractions to Decimals
Express as a decimal.
Here it is best to divide out:
Express as a decimal.
Here it is easier to make the denominator a multiple of 10
Express as a decimal in its simplest form
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Converting Fractions and Decimals
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Presentation 1 Multiplying and Dividing Decimals
Presentation 3 Negative Numbers
Presentation 4 Operations with Negative Numbers
Presentation 5 Estimating Answers
Unit 1Decimals & Fractions
Negative Numbers
Example 1
What is 15oC less than 26oC?
Solution
26oC – 15oC = 11oC
Example 2
What is 15oC less than 10oC?
Solution
10oC – 15oC = – 5oC
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Negative Numbers
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Presentation 1 Multiplying and Dividing Decimals
Presentation 2 Converting Fractions and Decimals
Presentation 4 Operations with Negative Numbers
Presentation 5 Estimating Answers
Unit 1Decimals & FractionsOperations with Negative
Numbers
Remember …
Example 1
Remember …
Example 2
Remember …
Example 3
Remember …
Example 4
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Operations with Negative Numbers
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Presentation 1 Multiplying and Dividing Decimals
Presentation 2 Converting Fractions and Decimals
Presentation 3 Negative Numbers
Presentation 5 Estimating Answers
Unit 1Decimals & Fractions
Estimating Answers
It is important to be able to estimate answers to complex calculations.
Without a calculator which of the answers is equal to ?
A 1∙649 B 16∙494 C 164∙945
Without a calculator which of the answers is equal to ?
You have to approximate each answer in the calculation. Hence, for example
A 1∙649 B 16∙494 C 164∙945
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Estimating Answers
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Presentation 1 Multiplying and Dividing Decimals
Presentation 2 Converting Fractions and Decimals
Presentation 3 Negative Numbers
Presentation 4 Operations with Negative Numbers