CPM Homework Help : MC1 Problem 2-107

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Home > MC1 > Chapter 2 > Lesson 2.3.1 > Problem 2-107

2-107.

Show the numbers of + and − pieces represented by each expression below. Sketch each model and state the number that it represents.

$(−2)+(−6)$
Step (1a):
Sketch a model of the integers.

Step (2a):
From the model, determine what the expression represents.
Hint (a):
For more help, look at the Math Notes in Lesson 2.3.1.
Answer (a):
$-8$

$(−2)+4+(−2)$
Hint (b):
Use part (a) as a guide for this problem. Remember to look for and eliminate zeros.
Answer (b):
Draw a diagram to model this expression. This expression represents 0.

$5+(−8)$
Hint (c):
Use part (a) as a guide for solving this problem.

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