December 03, 2013 - TTMS Math...
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Lesson 9 Sums and Differences of Decimals.notebook 1 December 03, 2013 I will use my knowledge of adding and subtracting multidigit numbers to find the sums and differences of decimals. Today's Objective:
Transcript of December 03, 2013 - TTMS Math...
Lesson 9 Sums and Differences of Decimals.notebook
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December 03, 2013
I will use my knowledge of adding and subtracting multidigit numbers to find the sums and differences of decimals.
Today's Objective:
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Example 1:
25 376 3 10
77 100+
Example 2:
426 27515
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Review adding fractions
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When do you think it might be easier to convert a mixed number to a decimal before adding or subtracting them?
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Place Value
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I DO:
4261
5275 1
2
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WE DO
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YOU DO
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YOU DO
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Use a calculator to convert the fractions into decimals before calculating the sum or difference.
5. Rahzel wants to determine how much gasoline he and his wife use in a month. He calculated that he used 78 gallons of gas last month. Rahzel’s wife used 41 gallons of gas last month. How much total gas did Rahzel and his wife use last month? Round your answer to the nearest hundredth.
Expression: Estimated answer:
Actual answer:
38
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Closing:
* Let's share answers and processes for each of the exercise problems.
* Which exercises would be easiest if the addends, minuends, or subtrahends were converted to decimals.
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December 03, 2013
Exit Ticket:
Solve each problem. Show the placement of the decimal is correct through either estimation or fraction multiplication.
1. 382 − 191
2. 594 + 893
87 100
3 10
7 25
71 100
