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

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

Part 1: What is Rounding? Copyright © 2009 Kelly Mott

What is Rounding? Rounding is a way to estimate or tell about how many. Rounding does not give an exact amount. How many cookies are in the cookie jar? Answer: There are about 20 cookies in the cookie jar. Copyright © 2009 Kelly Mott

Answer: About 300 kids attend East Elementary. What is Rounding? Here’s another example: How many kids go to East? Answer: About 300 kids attend East Elementary. Copyright © 2009 Kelly Mott

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

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

Can you think of an example of when we might use rounding? What is Rounding? Can you think of an example of when we might use rounding? Copyright © 2009 Kelly Mott

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

Round to the Nearest Ten What is 13 rounded to the nearest ten? Find 13 on the number line. Put a dot. Is 13 closer to 10 or 20? __________________ Answer: 13 rounded to the nearest ten is ____ 10 11 12 13 14 15 16 17 18 19 20 Copyright © 2009 Kelly Mott

Round to the Nearest Ten What is 19 rounded to the nearest ten? Find 19 on the number line. Put a dot. Is 19 closer to 10 or 20? __________________ Answer: 19 rounded to the nearest ten is ____ 10 11 12 13 14 15 16 17 18 19 20 Copyright © 2009 Kelly Mott

Round to the Nearest Ten *Hint: When we have 5 or more, we round up. What is 15 rounded to the nearest ten? Find 15 on the number line. Put a dot. Is 15 closer to 10 or 20? __________________ Answer: 15 rounded to the nearest ten is ____ 10 11 12 13 14 15 16 17 18 19 20 *Hint: When we have 5 or more, we round up. Copyright © 2009 Kelly Mott

Does this make sense? Copyright © 2009 Kelly Mott

Copyright © 2009 Kelly Mott

Copyright © 2009 Kelly Mott

Round to the Nearest Ten What is 54 rounded to the nearest ten? Find 54 on the number line. Put a dot. Is 54 closer to 50 or 60? __________________ Answer: 54 rounded to the nearest ten is ____ 50 51 52 53 54 55 56 57 58 59 60 Copyright © 2009 Kelly Mott

Round to the Nearest Ten What is 78 rounded to the nearest ten? Find 78 on the number line. Put a dot. Is 78 closer to 70 or 80? __________________ Answer: 78 rounded to the nearest ten is ____ 70 71 72 73 74 75 76 77 78 79 80 Copyright © 2009 Kelly Mott

Round to the Nearest Ten *Hint: When we have 5 or more, we round up. What is 85 rounded to the nearest ten? Find 85 on the number line. Put a dot. Is 85 closer to 80 or 90? __________________ Answer: 85 rounded to the nearest ten is ____ 80 81 82 83 84 85 86 87 88 89 90 *Hint: When we have 5 or more, we round up. Copyright © 2009 Kelly Mott

Copyright © 2009 Kelly Mott

Copyright © 2009 Kelly Mott

Round to the Nearest Ten What is 42 rounded to the nearest ten? Find 42 on the number line. Put a dot. Is 42 closer to 40 or 50? __________________ Answer: 42 rounded to the nearest ten is ____ 40 41 42 43 44 45 46 47 48 49 50 Copyright © 2009 Kelly Mott

Round to the Nearest Ten *Hint: When we have 5 or more, we round up. What is 65 rounded to the nearest ten? Find 65 on the number line. Put a dot. Is 65 closer to 60 or 70? __________________ Answer: 65 rounded to the nearest ten is ____ 60 61 62 63 64 65 66 67 68 69 70 *Hint: When we have 5 or more, we round up. Copyright © 2009 Kelly Mott

Round to the Nearest Ten What is 26 rounded to the nearest ten? Find 26 on the number line. Put a dot. Is 26 closer to 20 or 30? __________________ Answer: 26 rounded to the nearest ten is ____ 20 21 22 23 24 25 26 27 28 29 30 Copyright © 2009 Kelly Mott

Copyright © 2009 Kelly Mott

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

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

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

67 Practice # 2: STEPS: Underline the place you are rounding to. Circle the number to the right. If the number to the right is 0, 1, 2, 3, or 4, then the underlined number stays the same. If the number to the right is 5, 6, 7, 8, or 9, then the underlined number needs to go up 1 more number. Every number to the right of the underlined number becomes a zero. Round to the nearest ten: 67 Hint for the Circled Number: 4 or less just ignore. 5 or more, add 1 more. Copyright © 2009 Kelly Mott

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

91 Practice # 4: STEPS: Underline the place you are rounding to. Circle the number to the right. If the number to the right is 0, 1, 2, 3, or 4, then the underlined number stays the same. If the number to the right is 5, 6, 7, 8, or 9, then the underlined number needs to go up 1 more number. Every number to the right of the underlined number becomes a zero. Round to the nearest ten: 91 Hint for the Circled Number: 4 or less just ignore. 5 or more, add 1 more. Copyright © 2009 Kelly Mott

86 Practice # 5: STEPS: Underline the place you are rounding to. Circle the number to the right. If the number to the right is 0, 1, 2, 3, or 4, then the underlined number stays the same. If the number to the right is 5, 6, 7, 8, or 9, then the underlined number needs to go up 1 more number. Every number to the right of the underlined number becomes a zero. Round to the nearest ten: 86 Hint for the Circled Number: 4 or less just ignore. 5 or more, add 1 more. Copyright © 2009 Kelly Mott

45 Practice # 6: STEPS: Underline the place you are rounding to. Circle the number to the right. If the number to the right is 0, 1, 2, 3, or 4, then the underlined number stays the same. If the number to the right is 5, 6, 7, 8, or 9, then the underlined number needs to go up 1 more number. Every number to the right of the underlined number becomes a zero. Round to the nearest ten: 45 Hint for the Circled Number: 4 or less just ignore. 5 or more, add 1 more. Copyright © 2009 Kelly Mott

54 Practice # 7: STEPS: Underline the place you are rounding to. Circle the number to the right. If the number to the right is 0, 1, 2, 3, or 4, then the underlined number stays the same. If the number to the right is 5, 6, 7, 8, or 9, then the underlined number needs to go up 1 more number. Every number to the right of the underlined number becomes a zero. Round to the nearest ten: 54 Hint for the Circled Number: 4 or less just ignore. 5 or more, add 1 more. Copyright © 2009 Kelly Mott

78 Practice # 9: STEPS: Underline the place you are rounding to. Circle the number to the right. If the number to the right is 0, 1, 2, 3, or 4, then the underlined number stays the same. If the number to the right is 5, 6, 7, 8, or 9, then the underlined number needs to go up 1 more number. Every number to the right of the underlined number becomes a zero. Round to the nearest ten: 78 Hint for the Circled Number: 4 or less just ignore. 5 or more, add 1 more. Copyright © 2009 Kelly Mott

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

85 Practice # 10 STEPS: Underline the place you are rounding to. Circle the number to the right. If the number to the right is 0, 1, 2, 3, or 4, then the underlined number stays the same. If the number to the right is 5, 6, 7, 8, or 9, then the underlined number needs to go up 1 more number. Every number to the right of the underlined number becomes a zero. Round to the nearest ten: 85 Hint for the Circled Number: 4 or less just ignore. 5 or more, add 1 more. Copyright © 2009 Kelly Mott

91 Practice # 11 STEPS: Underline the place you are rounding to. Circle the number to the right. If the number to the right is 0, 1, 2, 3, or 4, then the underlined number stays the same. If the number to the right is 5, 6, 7, 8, or 9, then the underlined number needs to go up 1 more number. Every number to the right of the underlined number becomes a zero. Round to the nearest ten: 91 Hint for the Circled Number: 4 or less just ignore. 5 or more, add 1 more. Copyright © 2009 Kelly Mott

72 Practice # 14 STEPS: Underline the place you are rounding to. Circle the number to the right. If the number to the right is 0, 1, 2, 3, or 4, then the underlined number stays the same. If the number to the right is 5, 6, 7, 8, or 9, then the underlined number needs to go up 1 more number. Every number to the right of the underlined number becomes a zero. Round to the nearest ten: 72 Hint for the Circled Number: 4 or less just ignore. 5 or more, add 1 more. Copyright © 2009 Kelly Mott

89 Practice # 12 STEPS: Underline the place you are rounding to. Circle the number to the right. If the number to the right is 0, 1, 2, 3, or 4, then the underlined number stays the same. If the number to the right is 5, 6, 7, 8, or 9, then the underlined number needs to go up 1 more number. Every number to the right of the underlined number becomes a zero. Round to the nearest ten: 89 Hint for the Circled Number: 4 or less just ignore. 5 or more, add 1 more. Copyright © 2009 Kelly Mott

27 Practice # 13 STEPS: Underline the place you are rounding to. Circle the number to the right. If the number to the right is 0, 1, 2, 3, or 4, then the underlined number stays the same. If the number to the right is 5, 6, 7, 8, or 9, then the underlined number needs to go up 1 more number. Every number to the right of the underlined number becomes a zero. Round to the nearest ten: 27 Hint for the Circled Number: 4 or less just ignore. 5 or more, add 1 more. Copyright © 2009 Kelly Mott

35 Practice # 15 STEPS: Underline the place you are rounding to. Circle the number to the right. If the number to the right is 0, 1, 2, 3, or 4, then the underlined number stays the same. If the number to the right is 5, 6, 7, 8, or 9, then the underlined number needs to go up 1 more number. Every number to the right of the underlined number becomes a zero. Round to the nearest ten: 35 Hint for the Circled Number: 4 or less just ignore. 5 or more, add 1 more. Copyright © 2009 Kelly Mott

83 Practice # 16 STEPS: Underline the place you are rounding to. Circle the number to the right. If the number to the right is 0, 1, 2, 3, or 4, then the underlined number stays the same. If the number to the right is 5, 6, 7, 8, or 9, then the underlined number needs to go up 1 more number. Every number to the right of the underlined number becomes a zero. Round to the nearest ten: 83 Hint for the Circled Number: 4 or less just ignore. 5 or more, add 1 more. Copyright © 2009 Kelly Mott

Copyright © 2009 Kelly Mott

Does this make sense? Copyright © 2009 Kelly Mott

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

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

Practice Rounding to the Nearest 10 AAA Math http://www.aaamath.com/B/g32_rox2.htm Jan Brett Seashell site – rounding to the nearest ten http://www.janbrett.com/piggybacks/rounding.htm Copyright © 2009 Kelly Mott