### Home > CCA > Chapter A > Lesson A.1.3 > Problem A-33

A-33.

Without a calculator, compute the value of each expression below.

Use the Commutative Property of Addition and your understanding of minus signs to make this a subtraction problem.

When you multiply two numbers with the same sign, you will always get a positive result.

Change the subtraction into an addition of the

−30

Simplify before multiplying

Multiply from left to right, finding the correct sign for each step before moving on.

−12

Division uses the same rules

for signs as multiplication.