Chapter 1: Number Sense Section 1: Integers
Topics in Algebra 1 © 2001 Texas Instruments Teacher Notes 1-8
Observations
The
Observations
help students understand operations with signed integers. If necessary, tell
students how to find the
Observations
.
Observation 1
How far apart are the bird and the fish? Should the answer be
positive or negative? Students write an explanation of their
answers.
The bird and the fish are +
125
ft. apart. The distance is
positive.
(
Students will see the answers on the next three
screens. Signed numbers give a perspective as shown on the
screens.
)
Explanations will vary.
Students see the answers
on the following three
screens.
Observation 2
What is the sign of the answer to the problem
M
3
Q
M
11?
The answer is positive.
M
3
Q
M
11 = 33.
Students see grids
explaining the rules.
What are the rules for multiplying and dividing signed numbers?
The product of a positive and negative number is negative.
The product of two numbers with the same sign is positive.
Rules for division are similar to the rules for multiplication.
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