Operations with Integers Review

Operations with Integers Review

Addition

Subtraction

Multiplication

Division

Rules for Addition

• If the signs are the same, add and keep the sign.

• If the signs are different, subtract and keep the sign of the "larger" number.

• Example: -5 + (-10) = -15

• Example: -5 + 10 = 5

Multiple Choice

 $-25\ +\ \left(-30\right)$  

•  $-55$  

• 55

• -5

• 5

Rules for Subtraction

• Change to an addition problem by changing the sign.

• Example:  $-14-6=-14+\left(-6\right)=-20$  

• Example:

   $-2-\left(-4\right)=-2+4=2$  

Multiple Select

Check all that are true.

• $-3-12=-3+\left(-12\right)=-15$

• $-18-\left(-12\right)=18+12=30$

• $14-21=14+\left(-21\right)=7$

• $6-16=6+\left(-16\right)=-10$

Rules for multiplication or division.

• Think of the triangle.

  
  

• Same signs the answer is positive.

• Opposite signs the answer is negative.

Let's practice with markerboards!