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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 -
• 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
• 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.
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