Adding and Subtracting Integers

Adding and Subtracting Integers

Remember These?

Multiple Choice

Which of These is an Integer?

• 45.34

• -2/5

• -374

• 0.05

Multiple Choice

What is the opposite of -10?

• +10

• 100

• 0

• -100

Multiple Choice

Which of These is a Zero Pair?

• 64, -46

• -64, 46

• 25, 0.25

• 25, -25

Multiple Choice

What is the Absolute Value of -12?

• -12

• 12

• 21

• -21

Adding Integers

• Adding a positive number is the same as addition (the answer gets bigger)

• +5 + (+6) = +11

• Adding a negative number is the same as subtraction (the answer gets smaller)

• +5 + (-6) = -1

Subtracting Integers

• When we subtract integers, change to addition and switch the sign of the second number

Subtracting Integers

• Subtracting a positive number is the same as adding a negative number

• 7-4 can be re-written as 7+ (-4)

• (The answer gets smaller)

Subtracting Integers

• Subtracting a negative number is the same as adding a positive number (the answer gets bigger)

• 25 - (-5) can be re-written as 25+ (+5) 0r 25+5

Fill in the Blank

How would we re-write this equation to solve it? -17-4=?

Fill in the Blank

What about this one? 100- (-18) =