1 / 36

Round whole numbers to the nearest 10 or 100.

Round whole numbers to the nearest 10 or 100. 72 ÷ 4 =. 18. 18. 4. 72. we know 10 x 4 40. 32. we know 8 x 4 32. 0. We highlight the times table we are using. We circle the number of groups. 84 ÷ 6 =. 14. 14. 6. 84. we know 10 x 6 60. 24. we know 4 x 6 24. 0.

aalison
Download Presentation

Round whole numbers to the nearest 10 or 100.

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Round whole numbers to the nearest 10 or 100.

  2. 72 ÷ 4 = 18 18 4 72 we know 10 x 4 40 32 we know 8 x 4 32 0 We highlight the times table we are using. We circle the number of groups.

  3. 84 ÷ 6 = 14 14 6 84 we know 10 x 6 60 24 we know 4 x 6 24 0 We highlight the times table we are using. We circle the number of groups.

  4. Try this one on your whiteboard… 96 ÷ 6 = 16 16 6 96 we know 10 x 6 60 36 we know 6 x 6 36 0

  5. Try this one on your whiteboard… 112 ÷ 8 = 14 14 8 112 we know 10 x 8 80 32 we know 4 x 8 32 0

  6. Try this one on your whiteboard… 108 ÷ 6 = 18 18 6 108 we know 10 x 6 60 48 we know 8 x 6 48 0

  7. Try this one on your whiteboard… 125 ÷ 5 = 25 25 5 125 we know 10 x 5 50 75 we know 10 x 5 50 25 we know 5 x 5 25 0

  8. Learning Objective Revise Chunking

  9. PROBLEM! 78 children will be placed in teams of 6. How many teams will there be? Q. What calculation do we need to solve this problem? When you have decided how to do it work out the answer.

  10. We need to do the division sum78 ÷ 6. We can do this by chunking… 78 - 60 ( 10 x 6 ) 18 - 18 ( 3 x 6 ) 0 Q. How many 6’s have been subtracted? 78 ÷ 6 = 13

  11. Q. What would be the answer if there had been 80 children?

  12. Using chunking…. 80 - 60 (10 x 6 ) 20 - 18 ( 3 x 6 ) 2 13 r.2 Using pencil and paper we write… 80 ÷ 6 = 13 remainder 2

  13. Try this one with a partner There are 85 sweets to be shared equally among 7 children. How many sweets does each child have? How many are left?

  14. Using chunking… 85 -70 (10 x 7) 15 - 14 ( 2 x 7) 1 12 r.1 Using pencil and paper… 85 ÷ 7 = 12 r.1

  15. 175 ÷ 7 In pairs discuss how you could calculate an answer to this.

  16. Using chunking… 175 - 70 (10 x 7) 105 - 70 (10 x 7) 35 - 35 ( 5 x 7) 0 Answer = 25

  17. Try these: 134 ÷ 5 157 ÷ 6 119 ÷ 5

  18. Q. What is a quick way to check whether the answer to a division is correct?

  19. To check whether the answer to a division is correct we can use the INVERSE operation.

  20. LOOK… 57 ÷ 3 = 19 Q. Which two numbers should we multiply to check whether this is correct?

  21. 57 ÷ 3 = 19 To use the inverse operation we should multiply 19 by 3. 19 x 3 = 57

  22. Revise Bus Stop Method of Division OMA

  23. Learning Objective Express a quotient as a fraction, or as a decimal rounded to one decimal place.

  24. Mentally divide the following … 35 ÷ 5 27 ÷ 3 56 ÷ 8 49 ÷ 7 63 ÷ 9 42 ÷ 6

  25. The purpose of the lesson is to consider divisions that do not always have whole number answers.

  26. 46/7= Look at this as a multiplication! How many sevens make 46?

  27. YOUR TASK! Find the closest multiple below the number. How many 7s make this multiple? Calculate how many sevenths to get from the closest multiple to your number.

  28. Revise Bus Stop Method of Division

  29. Learning Objective Express a quotient as a fraction, or as a decimal rounded to one decimal place.

  30. How can we write this as a decimal? What other easy divisors are there?

More Related