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Continuing Rounding Numbers Math Workshop 3 rd Period January 24, 2011

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Agenda Bell Ringer – 10 Rounding Questions Review homework and graphs (grades) Continuing Rounding Numbers (PowerPoint) Class Work (Worksheets on Rounding Numbers) Independent/Pairs Homework – Due Monday, January 23

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Place Values and Rounding For example: Round to the nearest 100 (hundred) 231 What number is in the hundreds place? Underline that number 231 Place a dot below the number to the right of the underlined number 231 Does a three mean to round up or stay the same? 0 – 4 = stay on the floor and 5 – 9 = climb the vine Round down (stay the same) Add zeros behind the number you underlined 200

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Steps to a Successful Rounding 1. What are we rounding? 2. Underline the number we are rounding 3. Place a dot below the number to the right of the underlined number 4. Does the dotted number tell us to round up or stay the same? 5. 0 - 4 stay on the floor (SAME) 5 - 9 climb the vine (UP) 6. Round the Underlined Number Up keep the SAME 7. Add zeros behind the number you underlined

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A Rhyme to Remember… 0 through 4 stay on the floor 5 through 9 climb the vine

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Examples: Round 18 to the nearest 10s (tens) One is in the tens place. Pick the only two numbers it can be… 10 or 20 18 What does the 8 tell me? 5 – 9 Climb the Vine (UP) One number higher than 1 is… 2 Add zeros behind the underlined number 20

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Examples: Round 13 to the nearest 10s (tens) One is in the tens place. Pick the only two numbers it can be… 10 or 20 13 What does the 3 tell me? 0 – 4 Stay on the Floor (SAME) 1 can stay the same Add zeros behind the underlined number 10

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Examples: Round 370 to the nearest 100s (hundreds) Three is in the hundreds place. Pick the only two numbers it can be… 300 or 400 370 What does the 7 tell me? 5 – 9 Climb the Vine (UP) One number higher than 3 is… 4 Add zeros behind the underlined number 400

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Examples: Round 105 to the nearest 100s (hundreds) One is in the hundreds place. Pick the only two numbers it can be… 100 or 200 105 What does the 0 tell me? 0 – 4 Stay on the Floor (SAME) 1 can stay the same Add zeros behind the underlined number 100

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Example: Round 257 to the nearest 10s (tens) Two is in the hundreds place. Pick the only two numbers it can be… 200 or 300 257 What does the 7 tell me? 5 – 9 Climb the Vine (UP) One number higher than 5 is… 6 Add zeros behind the underlined number 260

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Class Work Students will work on worksheets at their pace on Rounding Numbers. You may work independently or with pairs. Raise your hand if you have a question.

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Homework Students will be given 10 practice problems on rounding to complete by Wednesday’s class.

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Unit 2 Lesson 9 Part 2: Estimating Sums to the Nearest 100 Copyright © 2010 Kelly Mott.

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