Lesson 2: Place Value and Rounding GROUP LESSON Per 3, 5: 9/14/15 Per: 2, 4, 6: 9/15/15

Lesson Objective Group will be able to… Effectively and efficiently take concise notes on the topic of place value and rounding. Properly be able to identify the value of specific digits in a number. Accurately round to a given place value. Students… write down the lesson objective.

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 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

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 need to divide two places after the decimal) Let’s practice…

Answer: =15.6

Quiz Yourself on Whiteboard Divide 249 by 13. Round to the nearest hundredths. Students….don’t write this down. Quiz yourself and each other in the group by answering on your whiteboard. Facilitator…make sure you work together on any incorrect answers.

Answer: =19.15

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. Students….don’t write this down. Quiz yourself and each other in the group by answering on your whiteboard. Facilitator…make sure you work together on any incorrect answers.

Answer: = Dan received a 76.5% on his science quiz.

Quiz Yourself on Whiteboard Round 1.2635 to the nearest tenth Students….don’t write this down. Quiz yourself and each other in the group by answering on your whiteboard. Facilitator…make sure you work together on any incorrect answers.

Quiz Yourself on Whiteboard Round 12.45678 to the nearest hundredths.

Whiteboard CFU Round 34.576456 to nearest thousandths.

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

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. Students….don’t write this down. Quiz yourself and each other in the group by answering on your whiteboard. Facilitator…make sure you work together on any incorrect answers.

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