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Number Lines and Rekenreks : Tools that COUNT!!

Number Lines and Rekenreks : Tools that COUNT!!. Presented by: Angela J. Williams AMSTI Math Specialist. Number Lines. What can I do to prepare students to use a number line flexibly?. Creating a Number Line . Use: 50 beads of 1 color 50 beads of a 2 nd color

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Number Lines and Rekenreks : Tools that COUNT!!

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  1. Number Lines and Rekenreks:Tools that COUNT!! Presented by: Angela J. Williams AMSTI Math Specialist

  2. Number Lines

  3. What can I do to prepare students to use a number line flexibly?

  4. Creating a Number Line Use: 50 beads of 1 color 50 beads of a 2nd color Alternate beads every 10.

  5. Activities with the Number Line • Count the beads by 1s (forward and backward). • 12 and 21 are two numbers. Find them on your number line and describe them to your partner. • Can you count from 16 to 31?

  6. Activities with the Number Line • Where is 47? How many tens are in this number? How many ones? • Find 35. What is 10 more? 10 less? • Find 34. Is it closer to 30 or 40? How do you know? • Start at 3. Count forward by 10s. What is the last number you say?

  7. Activities with the Number Line • Start at 82. Count back three 10s. Where do you end? • Find 36. How far are you from 100? Are you closer to 100 or 0? • Count by 5s. How many sets of 5 are in 100?

  8. Activities with the Number Line • Find 53. Add 15. Where do you end? 53 + 15 = 68 • Find 36. Find 61. What do you add to 36 to get to 61? 36 + ___ = 61 • Add three 10s to 28. What number do you have? 28 + 30 = 58

  9. Activities with the Number Line • Find 66. Take 31 away. Where are you? 66 – 31 = 35 • Find 75. Find 58. How far apart are they? 75 – 58 = 17 • Find 47. Find 19. What is the difference between them? 47 - ___ = 19

  10. Research Says: “The use of number lines increases students’ ability to use numbers flexibly, estimate, and visualize numbers and therefore increases number sense.” (Wright, 2001)

  11. Resources • http://nzmaths.co.nz/resource/number-lines-and-bead-strings?parent_node= • books.google.com/books?isbn=0826486878 • http://www.smartfirstgraders.com/number-line.html • http://www.education.com/activity/article/numberlinegame_first/

  12. If this is what I want….WHERE DO I START?

  13. What the heck is a rekenrek?

  14. How will a rekenrek help my students?

  15. Let’s Make a Rekenrek! Use: 10 beads of 1 color 10 beads of a 2nd color Top row: 5 beads of 1st color. 5 beads of 2nd color. Bottom row: 5 beads of 1st color. 5 beads of 2nd color.

  16. Rekenrek Activity #1 Making 5 and 10 Visible

  17. Rekenrek Activity #2 Quick Images

  18. Rekenrek Activity #3 Number sense strategies

  19. Rekenrek Activity #4 Multiple ways to Find a sum

  20. Rekenrek Activity #5 Understanding doubles

  21. Rekenrek Activity #6 Think Addition: Missing addends

  22. Resources • http://bridges1.mathlearningcenter.org/media/Rekenrek_0308.pdf • http://www.therekenrek.com/2013/ • http://www.k-5mathteachingresources.com/Rekenrek.html • https://cesa5mathscience.wikispaces.com/file/view/Learning+to+Think+Mathematically+with+the+Rekenrek.pdf • http://www.k-5mathteachingresources.com/support-files/large10frames1-10.pdf

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