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Unit 1 Decimals & Fractions. Unit 1 Decimals & 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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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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Unit 1Decimals & Fractions Converting 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
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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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Unit 1Decimals & Fractions Operations with Negative Numbers
Remember … Example 1
Remember … Example 2
Remember … Example 3
Remember … Example 4
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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 ? B 16∙494 C 164∙945 A 1∙649
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
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