CPM Homework Help : CC1 Problem 4-20

Each expression below begins with $-5$ and then adds something to it. As you look at each expression, state which direction you should move on a number line if you start at $-5$ . Then simplify each expression.

For example, if the expression reads $-5+(-9)$ , you would write “left, $-14$ ,” since from $-5$ you would move left on a number line $9$ units and would end up at $-14$ .

$-5+(-4.5)$
Answer (a):
See the diagram below.

$-5+(-8)$
Hint (b):
See the hint for part (a).
Answer (b):
Left, $-13$ .

$-5+6\frac{3}{5}$
Hint (c):
Which direction should you move to add

A number line scaled in ones from negative 10 to 2. Movement from negative 5 to negative 9.5.