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Take out homework and a pencil to prepare
for the homework quiz!
Check the file folder for your class to pick up
graded work
◦ Located by the bookshelf, blue crate.
◦ Look behind the tab for your class period and take
home anything with your name on it.
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Turn to page 110 in your textbook.
Perform the In-Class Experiment with members at your
table.
Check your answers:
1. G
2. A
3. B
4. E
5. C
6. D
7. H
8. I
9. F
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Refer to the Handout on the properties of
arithmetic.
You need to know the significance of these
rules.
It’s not imperative that you memorize the
names of the properties—for this course
anyway.
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On page 112, complete problems 1 and 2
independently, and then check your
work/answers with others at your table when
you are finished.
Check your answers (note that each person may
have different variables in each example):
1. a. a  1  a
b b
b. c – d = c + (–d)
c. ab = (–a)  (–b)
1
1
a
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and
b
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d. If ab = 1, then
b
a
2. a. If “a = 0” is true, then “a = 0 or b = 0” is true.
b. Every nonzero number has a reciprocal.
c. The left side becomes b and the right side becomes
0.
d. It shows that either a or b has to be 0. If a  0, then
b = 0.