1 / 21

Algebraic thinking

Algebraic thinking. When one number is near a Hundred. When One Number Is Near a Hundred. 98 + 48 Add on 2 - to make a tidy number 97 + 38 Similar but add on three 96 + 87 Generalisation is what always works Number added on changed, but reason for didn’t

fineen
Télécharger la présentation

Algebraic thinking

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. Algebraic thinking

  2. When one number is near a Hundred

  3. When One Number Is Near a Hundred • 98 + 48 • Add on 2 - to make a tidy number • 97 + 38 • Similar but add on three • 96 + 87 • Generalisation is what always works • Number added on changed, but reason for didn’t • Know that what you add on, you must subtract

  4. Algebraic thinking • 98 + 48 = (98 + ) + (48 _____ If I do this… What do I do here?

  5. Algebraic thinking • 98 + 48 = (98 + ) + (48 - )

  6. Algebraic Thinking • 98 + 47 = • Here = means get the answer

  7. Algebraic Thinking • 97 + 96 = 98 + 95 • Is this true? • Here = means balance

  8. Algebraic Thinking • 98 + 84 = 95 + 87 • Wrong structure • Must be up and down

  9. Algebraic Thinking • 84 + 39 = 81 + 41 • And be the same amount

  10. Algebraic Thinking • 61 + 58 = 59 +  • 64 +  = 61 + 38

  11. Algebraic Thinking • 6 +  = 9 +  • Insert a pair of numbers that make this true

  12. Algebraic Thinking • 6 +  = 9 +  • Write a statement to link these that is always true

  13. Algebraic Thinking • 7 +  = 11 +  • Make a general statement

  14. Algebraic Thinking • 10 +  = 6 +  • Make a general statement

  15. Algebraic Thinking • 41 + n = 43 + _______ • Don’t simplify, use the structure

  16. Algebraic Thinking • 41 + n = 43 + (n - 2) • Because 41 goes up 2, n must go down 2

More Related