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Visual Models and the distributive property: Standard Algorithm

Visual Models and the distributive property: Standard Algorithm. Monday, September 14, 2014. Mental Math. 9x10 9x10= 90 9x9=90-___ 9x9=90-9 9x9=______ 9x9=81. Multiply by multiples of 100. 31x100= 3100 3100x2= 6200 31x200 6200. Word Problem of the day!.

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Visual Models and the distributive property: Standard Algorithm

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  1. Visual Models and the distributive property:Standard Algorithm Monday, September 14, 2014

  2. Mental Math • 9x10 9x10= 90 • 9x9=90-___ 9x9=90-9 • 9x9=______ 9x9=81

  3. Multiply by multiples of 100 • 31x100= 3100 • 3100x2= 6200 • 31x200 6200

  4. Word Problem of the day! • Diamond is setting up a play space for her new puppy. She will be building a fence around part of her yard that measures 29 feet by 12 feet. How many square feet of play space will her new puppy have? (If you have time, is there more than one way to solve this question)

  5. Answer: • 29x12 29 is close to 30 so… 29=30-1 (12x30)-(12x1)= 360-12 348

  6. 21x5 • Can you solve this problem mentally? • Can we represent this problem using an area model?

  7. 23x31 23 23+690= 713 1 30 1x23= 23 30x23= 690

  8. 343x21 343 343 X 21 343 6860 7203 1 20 1x343= 343 20x343= 6860

  9. 231x32 7392

  10. Problem Set • You may work with one other student on your problem set. I will be calling groups to my back table. Please keep the noise down or we will work independently. *** If you are confident with this topic please move your number over to willing to help***

  11. Exit Ticket • Complete the area model then solve using the standard algorithm 21x23=________ 143x12=_______

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