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Rounding Numbers to the Nearest Hundred by Mrs. Zagrodny.

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Presentation on theme: "Rounding Numbers to the Nearest Hundred by Mrs. Zagrodny."— Presentation transcript:

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2 Rounding Numbers to the Nearest Hundred by Mrs. Zagrodny

3 When you find the hundred that is closest to a number, you are rounding.

4 For example, 400 is the closest ten to 360. So, 360 to the nearest 100 is rounded to 400.

5 Again, let’s think about a number line like a roller coaster.

6 You might think about a number line that looks like this: 100300200

7 On this number line, what number would come half way between 100 and 200? 100300200 150

8 What number would come half way between 200 and 300? 100300200 150250

9 What hundred would be next? 100300200 150250350 400 What number would be half way between?

10 Can you guess about where 170 would be on this number line? 100300200 150250350 40 170

11 100300200 150250350 400 170 If the roller coaster stopped, what number would it roll to?

12 Can you guess about where 230 would be on this number line? 100300200 150250 350 400 230

13 100300200 150250350 400 230 If the roller coaster stopped, what number would it roll to?

14 Can you guess about where 360 would be on this number line? 100 300200 150250350 400 360

15 What would you round it to? 100300200 150250350 400 360

16 Can you guess about where 410 would be on this number line? 100300200 150250350 400 410

17 What would you round it to? 100300200 150250350 400 410

18 Can you guess about where 190 would be on this number line? 100300200 150250350 400 190

19 Can you guess about where 190 would be on this number line? 100300200 150250350 400 190

20 100300200 150250350 400 190 What would you round it to?

21 What about a number like 250? It’s right in the middle! 100300200 150250350 40

22 Our rule is to round to the next hundred. 100300200 150250350 400

23 100300200 150250350 40 Tell a number that would round to 100. 110 120 130 140

24 When you round to the nearest hundred, look in the tens place. If it has 1,2,3, or 4 round down. If it has 5, 6,7, 8, or 9 round up.

25 To round remember this rhyme, 5, 6, 7, 8, 9 GO UP all the time!!

26 Rounding numbers is so fun, We will do it 'till we're done. If a number's 1-4, Round it down right through the floor. If a number's 5-9, Round it up it is just fine. Round up, Round down, 1,2,3,4 --- 1-2, 3-4

27 Now it’s your turn! You can get some help from the number line.

28 What hundred is closest to 560? Put your bean on the closest hundred.

29 What hundred is closest to 790? Put your bean on the closest hundred.

30 What hundred is closest to 830? Put your bean on the closest hundred.

31 What hundred is closest to 990? Put your bean on the closest hundred.

32 What hundred is closest to 650? Put your bean on the closest hundred.

33 What hundred is closest to 940? Put your bean on the closest hundred.

34 Are you roller coaster ready for an assignment?


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