### Home > CC1 > Chapter 4 > Lesson 4.1.1 > Problem4-9

4-9.

Simplify each expression below. For each expression, draw a picture or show how you know your answer makes sense. Homework Help ✎

1. $5+(−4)+12.65$

• Use a drawing such as the one to the right to help you make sense of the problem.

• Starting at 5, add −4. In other words, subtract 4.

• 13.65

1. $6.5+(−2)+10.5$

• See part (a).

1. $4(−5+100)$

Add what is in the parentheses first, then multiply by 4.

2. $−212+(−102)$

Use a drawing as in part (a) to help make sense of this problem.

3. $4+6(3)+2(5\frac{1}{2}−1)$

Remember to subtract what is in the parentheses first before multiplying by 2.

Make sure all multiplication is done before adding.

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4. $5+3(5)+(−4)(5)$