Integer Operations

Integer Operations

Mr. Donnelly

Subtract the 2 numbers and keep the sign of the larger number.

Different Sign

If adding 2 positives or 2 negatives we ADD AND KEEP

Same Sign

Adding Integers

Different Sign

Same Sign

Adding Integers

Draw

Evaluate

Evaluate, use dry erase boards if needed

$$-5+\left(-15\right)$$  

Draw

Evaluate

Evaluate, use dry erase boards if needed

$$-35+\left(10\right)$$  

Draw

Evaluate

Evaluate, use dry erase boards if needed

$$-7+\left(-14\right)$$  

Draw

Evaluate, use dry erase boards if needed

$$-12+\left(-14\right)$$  

Subtracting Integers

KCC

To subtract integers we use, Keep Change Change.

Keep the first number the same

Change subtraction to addition

Change sign of last number.​

Then follow rules of addition​

​Subtracting Integers

Draw

Evaluate, use dry erase boards if needed

$$-18-5$$  

Draw

Evaluate, use dry erase boards if needed

$$-8-\left(-11\right)$$  

Draw

Evaluate, use dry erase boards if needed

$$-8-\left(-25\right)$$  

Multiplying and dividing Integers

​The rule for Multiplying and Dividing can be remembered by

SSP and DSN

Same Sign Positive

​

Different Sign Negative​

Multiplying and dividing Integers

Example

Draw

Evaluate, use dry erase boards if needed

$$9\cdot\left(-3\right)$$  

Draw

Evaluate, use dry erase boards if needed

$$-\frac{2}{5}\cdot\left(-\frac{1}{9}\right)$$  

Draw

Evaluate, use dry erase boards if needed

$$-64\div\left(-8\right)$$  

Draw

Answer on dry erase board

$$-72\div\left(6\right)$$  

Determine sign

If multiplying or dividing with multiple terms, we can determine sign by looking at number of negatives.
Even number of negatives: positive answer

Odd number of negatives: negative answer