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February 26, 2009

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February 26, 2009. Can you do Division? Divide a loaf by a knife - what's the answer to that? ... Text 3.3 & 3.4 (Multiplication and Division) Explorations (so ... – PowerPoint PPT presentation

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Title: February 26, 2009


1
February 26, 2009
  • Can you do Division?  Divide a loaf by a knife -
    what's the answer to that? 
  • Lewis Carroll, Through the Looking
    Glass

2
February 26, 2009
  • Section 3.4 division
  • Exploration 3.15
  • Videos
  • Homework

3
February 26, 2009
  • Test 2 Thursday, 3/12 (50 min.)
  • Covers
  • Text 3.3 3.4 (Multiplication and Division)
  • Explorations (so far, 3.13 and 3.15)
  • Class Notes

4
3.4 Understanding Division
  • Explain what is wrong, and why its wrong
  • 50 7 is the same as 50 10, which is 5. But,
    I added 3 to the divisor, so now I need to
    subtract 3
  • 5 3 2.

5
3.4 (contd)
  • Multiplication and Division
  • In mathematics, we say that addition and
    subtraction are inverse operations. This is why
    there are related facts
  • 3 4 7 7 4 3 7 3 4
  • In this same way, multiplication and division are
    inverse operations
  • 3 4 12 12 4 3 12 3 4

6
3.4 (contd)
  • Exploration 3.15
  • On your own, make up a story problem for 15
    3
  • As a group
  • Share your problems.
  • Sort into two or more piles.
  • Select one from each pile and write it on the
    chart paper.

7
3.4 (contd)
  • Vocabulary
  • In any division problem,
  • dividend divisor quotient
  • In word problems, we usually have a rate as part
    of the problem (e.g. apples per person). Where
    the rate appears determines the type of word
    problem.

8
3.4 (contd)
  • Where is the rate?
  • Jack has 18 books. If he stacks 3 books per
    pile, how many piles of books can he make? This
    is repeated subtraction.
  • Jack has 18 books. If he wants to make 3 stacks
    of books, how many books will be in each stack?
    This is partitioning.

9
3.4 (contd)
  • Turn to Class Notes pg 11.
  • Take notes that will help you remember each
    childs strategy.

10
3.4 (contd)
  • With your table, discuss questions 5 8 on pg
    13. (Cross out the sentence about Shannon in
    6).
  • When finished, move on to pages 14 and 15. These
    will be collected on Tuesday.

11
Homework
  • Due Tuesday, 3/3
  • Link to online homework list
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