Lesson 2 Place Value and Rounding GROUP LESSON

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Lesson 2: Place Value and Rounding GROUP LESSON All Periods: 9/16/15

Lesson 2: Place Value and Rounding GROUP LESSON All Periods: 9/16/15

Lesson Objective Group will be able to… 1) Effectively and efficiently take concise notes

Lesson Objective Group will be able to… 1) Effectively and efficiently take concise notes on the topic of place value and rounding. 2) Properly be able to identify the value of specific digits in a number. 3) Accurately round to a given place value.

Place Value Copy this chart in your notebook and MEMORIZE each place value!

Place Value Copy this chart in your notebook and MEMORIZE each place value!

Rounding Decimals BIG NOTE: “Five or more, raise the score. Four or less, let

Rounding Decimals BIG NOTE: “Five or more, raise the score. Four or less, let it rest” Example: Round 3. 1416 to the nearest hundredths: Step 1: Find the hundredths place. Step 2: You must look at the number AFTER the hundredths place. Step 3: If the number is five or more, you must round up. If the number is four or less. You leave it the same.

So 3. 1416 is rounded to 3. 14

So 3. 1416 is rounded to 3. 14

Rounding Decimals when Dividing In order to round the appropriate place value, you must

Rounding Decimals when Dividing In order to round the appropriate place value, you must divide until after the given place value in order to know whether you round up or down.

Example: Divide 109 by 7. Round to the nearest tenths place. (which means you

Example: Divide 109 by 7. Round to the nearest tenths place. (which means you need to divide two places after the decimal) Let’s practice…

Answer: =15. 6

Answer: =15. 6

Quiz Yourself on Whiteboard Divide 249 by 13. Round to the nearest hundredths.

Quiz Yourself on Whiteboard Divide 249 by 13. Round to the nearest hundredths.

Answer: =19. 15

Answer: =19. 15

Quiz Yourself on Whiteboard Dan received a 13 out of 17 on his science

Quiz Yourself on Whiteboard Dan received a 13 out of 17 on his science quiz. What percentage did Dan receive on his quiz. Round to the nearest tenth.

Answer: = Dan received a 76. 5% on his science quiz.

Answer: = Dan received a 76. 5% on his science quiz.

Quiz Yourself on Whiteboard Round 1. 2635 to the nearest tenth

Quiz Yourself on Whiteboard Round 1. 2635 to the nearest tenth

Quiz Yourself on Whiteboard Round 12. 45678 to the nearest hundredths.

Quiz Yourself on Whiteboard Round 12. 45678 to the nearest hundredths.

Whiteboard CFU Round 34. 576456 to nearest thousandths.

Whiteboard CFU Round 34. 576456 to nearest thousandths.

Rounding with Whole Numbers When asked to round a number to the nearest tens,

Rounding with Whole Numbers When asked to round a number to the nearest tens, hundreds, etc, you would replace the removed digits with zero.

Example: Round 134. 9 to the nearest tens place. =130. . . the next

Example: Round 134. 9 to the nearest tens place. =130. . . the next digit (4) is less than 5 so we remove the 4 and replace it with a zero

Quiz Yourself on Whiteboard Round 12, 690 to the nearest thousands place.

Quiz Yourself on Whiteboard Round 12, 690 to the nearest thousands place.

Answer: = 13, 000 …the next digit is (6) is 5 or more so

Answer: = 13, 000 …the next digit is (6) is 5 or more so we round up.

Rounding Tens and Hundreds Key Terms Rounding RoundingRounding Tens and Hundreds Key Terms Rounding Rounding
Rounding up Rounding Numbers Rounding down Start aRounding up Rounding Numbers Rounding down Start a
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Lesson 2 Place Value and Rounding GROUP LESSONLesson 2 Place Value and Rounding GROUP LESSON
Rounding Rules for Rounding 1 IDENTIFY THE PLACERounding Rules for Rounding 1 IDENTIFY THE PLACE
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