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Unit 2 Lesson 7 Part 2: Rounding to the Nearest Hundred Copyright © 2009 Kelly Mott.

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Presentation on theme: "Unit 2 Lesson 7 Part 2: Rounding to the Nearest Hundred Copyright © 2009 Kelly Mott."— Presentation transcript:

1 Unit 2 Lesson 7 Part 2: Rounding to the Nearest Hundred Copyright © 2009 Kelly Mott

2 Unit 2 Lesson 7 Part 2: Rounding to the Nearest Hundred Copyright © 2009 Kelly Mott

3 Part 1: Understanding Rounding Copyright © 2009 Kelly Mott

4 Rounding is a way to estimate or tell about how many. Rounding does not give an exact amount. Copyright © 2009 Kelly Mott What is Rounding? How many marbles are in the jar? Answer: There are about 200 marbles in the jar.

5 Whenever you see the word: THAT MEANS THE ANSWER WAS ROUNDED! Copyright © 2009 Kelly Mott What is Rounding?

6 WHEN WE ROUND WE TELL: Copyright © 2009 Kelly Mott Rounding

7 Part 2: Rounding with a Number Line Copyright © 2009 Kelly Mott

8 What is 130 rounded to the nearest hundred? Find 130 on the number line. Put a dot. Is 130 closer to 100 or 200? _______________ Answer: 130 rounded to the nearest hundred is _____________________ 100 110 120 130 140 150 160 170 180 190 200 Copyright © 2009 Kelly Mott Round to the Nearest Hundred

9 What is 180 rounded to the nearest hundred? Find 180 on the number line. Put a dot. Is 180 closer to 100 or 200? _______________ Answer: 180 rounded to the nearest hundred is _____________________ 100 110 120 130 140 150 160 170 180 190 200 Copyright © 2009 Kelly Mott Round to the Nearest Hundred

10 What is 150 rounded to the nearest hundred? Find 150 on the number line. Put a dot. Is 150 closer to 100 or 200? _______________ Answer: 150 rounded to the nearest hundred is _____________________ 100 110 120 130 140 150 160 170 180 190 200 Copyright © 2009 Kelly Mott Round to the Nearest Hundred *Hint: When we have 5 or more, we round up.

11 Copyright © 2009 Kelly Mott

12

13 What is 340 rounded to the nearest hundred? Find 340 on the number line. Put a dot. Is 340 closer to 300 or 400? _______________ Answer: 340 rounded to the nearest hundred is _____________________ 300 310 320 330 340 350 360 370 380 390 400 Copyright © 2009 Kelly Mott Round to the Nearest Hundred

14 What is 670 rounded to the nearest hundred? Find 670 on the number line. Put a dot. Is 670 closer to 600 or 700? _______________ Answer: 670 rounded to the nearest hundred is _____________________ 600 610 620 630 640 650 660 670 680 690 700 Copyright © 2009 Kelly Mott Round to the Nearest Hundred

15 What is 450 rounded to the nearest hundred? Find 450 on the number line. Put a dot. Is 450 closer to 400 or 500? _______________ Answer: 450 rounded to the nearest hundred is _____________________ 400 410 420 430 440 450 460 470 480 490 500 Copyright © 2009 Kelly Mott Round to the Nearest Hundred *Hint: When we have 5 or more, we round up.

16 Copyright © 2009 Kelly Mott

17 Part 3: Rounding without a Number Line Copyright © 2009 Kelly Mott

18 Steps to Round a Number: STEPS: 1.Underline the place you are rounding to. 2.Circle the number to the right. 3.If the number to the right is 0, 1, 2, 3, or 4, then the underlined number stays the same. 4.If the number to the right is 5, 6, 7, 8, or 9, then the underlined number needs to go up 1 more number. 5.Every number to the right of the underlined number becomes a zero. Copyright © 2009 Kelly Mott Round to the nearest hundred: 260 Hint for the Circled Number: 4 or less just ignore. 5 or more, add 1 more.

19 Practice # 1 STEPS: 1.Underline the place you are rounding to. 2.Circle the number to the right. 3.If the number to the right is 0, 1, 2, 3, or 4, then the underlined number stays the same. 4.If the number to the right is 5, 6, 7, 8, or 9, then the underlined number needs to go up 1 more number. 5.Every number to the right of the underlined number becomes a zero. Copyright © 2009 Kelly Mott Round to the nearest hundred: 419 Hint for the Circled Number: 4 or less just ignore. 5 or more, add 1 more.

20 Practice # 2 STEPS: 1.Underline the place you are rounding to. 2.Circle the number to the right. 3.If the number to the right is 0, 1, 2, 3, or 4, then the underlined number stays the same. 4.If the number to the right is 5, 6, 7, 8, or 9, then the underlined number needs to go up 1 more number. 5.Every number to the right of the underlined number becomes a zero. Copyright © 2009 Kelly Mott Round to the nearest hundred: 608 Hint for the Circled Number: 4 or less just ignore. 5 or more, add 1 more.

21 Practice # 3 STEPS: 1.Underline the place you are rounding to. 2.Circle the number to the right. 3.If the number to the right is 0, 1, 2, 3, or 4, then the underlined number stays the same. 4.If the number to the right is 5, 6, 7, 8, or 9, then the underlined number needs to go up 1 more number. 5.Every number to the right of the underlined number becomes a zero. Copyright © 2009 Kelly Mott Round to the nearest hundred: 577 Hint for the Circled Number: 4 or less just ignore. 5 or more, add 1 more.

22 Practice # 4 STEPS: 1.Underline the place you are rounding to. 2.Circle the number to the right. 3.If the number to the right is 0, 1, 2, 3, or 4, then the underlined number stays the same. 4.If the number to the right is 5, 6, 7, 8, or 9, then the underlined number needs to go up 1 more number. 5.Every number to the right of the underlined number becomes a zero. Copyright © 2009 Kelly Mott Round to the nearest hundred: 825 Hint for the Circled Number: 4 or less just ignore. 5 or more, add 1 more.

23 Practice # 5 STEPS: 1.Underline the place you are rounding to. 2.Circle the number to the right. 3.If the number to the right is 0, 1, 2, 3, or 4, then the underlined number stays the same. 4.If the number to the right is 5, 6, 7, 8, or 9, then the underlined number needs to go up 1 more number. 5.Every number to the right of the underlined number becomes a zero. Copyright © 2009 Kelly Mott Round to the nearest hundred: 139 Hint for the Circled Number: 4 or less just ignore. 5 or more, add 1 more.

24 Practice # 6 STEPS: 1.Underline the place you are rounding to. 2.Circle the number to the right. 3.If the number to the right is 0, 1, 2, 3, or 4, then the underlined number stays the same. 4.If the number to the right is 5, 6, 7, 8, or 9, then the underlined number needs to go up 1 more number. 5.Every number to the right of the underlined number becomes a zero. Copyright © 2009 Kelly Mott Round to the nearest hundred: 765 Hint for the Circled Number: 4 or less just ignore. 5 or more, add 1 more.

25 Practice # 7 STEPS: 1.Underline the place you are rounding to. 2.Circle the number to the right. 3.If the number to the right is 0, 1, 2, 3, or 4, then the underlined number stays the same. 4.If the number to the right is 5, 6, 7, 8, or 9, then the underlined number needs to go up 1 more number. 5.Every number to the right of the underlined number becomes a zero. Copyright © 2009 Kelly Mott Round to the nearest hundred: 941 Hint for the Circled Number: 4 or less just ignore. 5 or more, add 1 more.

26 Practice # 8 STEPS: 1.Underline the place you are rounding to. 2.Circle the number to the right. 3.If the number to the right is 0, 1, 2, 3, or 4, then the underlined number stays the same. 4.If the number to the right is 5, 6, 7, 8, or 9, then the underlined number needs to go up 1 more number. 5.Every number to the right of the underlined number becomes a zero. Copyright © 2009 Kelly Mott Round to the nearest hundred: 289 Hint for the Circled Number: 4 or less just ignore. 5 or more, add 1 more.

27 Practice # 9 STEPS: 1.Underline the place you are rounding to. 2.Circle the number to the right. 3.If the number to the right is 0, 1, 2, 3, or 4, then the underlined number stays the same. 4.If the number to the right is 5, 6, 7, 8, or 9, then the underlined number needs to go up 1 more number. 5.Every number to the right of the underlined number becomes a zero. Copyright © 2009 Kelly Mott Round to the nearest hundred: 573 Hint for the Circled Number: 4 or less just ignore. 5 or more, add 1 more.

28 Practice # 10 STEPS: 1.Underline the place you are rounding to. 2.Circle the number to the right. 3.If the number to the right is 0, 1, 2, 3, or 4, then the underlined number stays the same. 4.If the number to the right is 5, 6, 7, 8, or 9, then the underlined number needs to go up 1 more number. 5.Every number to the right of the underlined number becomes a zero. Copyright © 2009 Kelly Mott Round to the nearest hundred: 610 Hint for the Circled Number: 4 or less just ignore. 5 or more, add 1 more.

29 Practice # 11 STEPS: 1.Underline the place you are rounding to. 2.Circle the number to the right. 3.If the number to the right is 0, 1, 2, 3, or 4, then the underlined number stays the same. 4.If the number to the right is 5, 6, 7, 8, or 9, then the underlined number needs to go up 1 more number. 5.Every number to the right of the underlined number becomes a zero. Copyright © 2009 Kelly Mott Round to the nearest hundred: 276 Hint for the Circled Number: 4 or less just ignore. 5 or more, add 1 more.

30 Practice # 12 STEPS: 1.Underline the place you are rounding to. 2.Circle the number to the right. 3.If the number to the right is 0, 1, 2, 3, or 4, then the underlined number stays the same. 4.If the number to the right is 5, 6, 7, 8, or 9, then the underlined number needs to go up 1 more number. 5.Every number to the right of the underlined number becomes a zero. Copyright © 2009 Kelly Mott Round to the nearest hundred: 459 Hint for the Circled Number: 4 or less just ignore. 5 or more, add 1 more.

31 Practice # 13 STEPS: 1.Underline the place you are rounding to. 2.Circle the number to the right. 3.If the number to the right is 0, 1, 2, 3, or 4, then the underlined number stays the same. 4.If the number to the right is 5, 6, 7, 8, or 9, then the underlined number needs to go up 1 more number. 5.Every number to the right of the underlined number becomes a zero. Copyright © 2009 Kelly Mott Round to the nearest hundred: 125 Hint for the Circled Number: 4 or less just ignore. 5 or more, add 1 more.

32 Practice # 14 STEPS: 1.Underline the place you are rounding to. 2.Circle the number to the right. 3.If the number to the right is 0, 1, 2, 3, or 4, then the underlined number stays the same. 4.If the number to the right is 5, 6, 7, 8, or 9, then the underlined number needs to go up 1 more number. 5.Every number to the right of the underlined number becomes a zero. Copyright © 2009 Kelly Mott Round to the nearest hundred: 708 Hint for the Circled Number: 4 or less just ignore. 5 or more, add 1 more.

33 Practice # 15 STEPS: 1.Underline the place you are rounding to. 2.Circle the number to the right. 3.If the number to the right is 0, 1, 2, 3, or 4, then the underlined number stays the same. 4.If the number to the right is 5, 6, 7, 8, or 9, then the underlined number needs to go up 1 more number. 5.Every number to the right of the underlined number becomes a zero. Copyright © 2009 Kelly Mott Round to the nearest hundred: 672 Hint for the Circled Number: 4 or less just ignore. 5 or more, add 1 more.

34 Practice # 16 STEPS: 1.Underline the place you are rounding to. 2.Circle the number to the right. 3.If the number to the right is 0, 1, 2, 3, or 4, then the underlined number stays the same. 4.If the number to the right is 5, 6, 7, 8, or 9, then the underlined number needs to go up 1 more number. 5.Every number to the right of the underlined number becomes a zero. Copyright © 2009 Kelly Mott Round to the nearest hundred: 880 Hint for the Circled Number: 4 or less just ignore. 5 or more, add 1 more.

35 Copyright © 2009 Kelly Mott

36 Does this make sense? Copyright © 2009 Kelly Mott

37 HOMEWORK Teacher Worksheet: Rounding to Nearest Hundred Worksheet Math Steps Pages: none Re-teach Page: none Copyright © 2009 Kelly Mott

38 You can use the Rounding Pyramid: 5 1 2 8 4 0 9 3 7 6 1.Underlined number rounds up one 2.Add the zeros 1.Underlined number stays the same 2.Add the zeros Copyright © 2009 Kelly Mott

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