Subtracting Integers

-124-166

• -290

• 43

• 42

• 93

Emily is a diver. Today she descended to a depth of 40 feet below sea level. Then she swam up 10 feet and descended another 4 feet. How far below sea level is Emily now?

• -34 feet

• -54 feet

• 54 feet

• -26 feet

If you have at least one negative integer in a subtraction problem, what do you do?

• subtract it

• change the subtraction sign into an addition sign and add.

• change the subtraction sign into an addition sign and change the sign of the second number, then follow integer addition rules.

• change the subtraction sign into and addition sign and change the sign of the first number.

To add a negative plus a positive, or a positive plus a negative---what is the rule?

• subtract and always put a negative sign

• subtract and take the sign of the larger number

• add and take the sign of the biggest number

• just subtract

Can you subtract if you have at least one negative integer in the problem?

-5 - 7

• no

• yes

-13 + (-2)

• -15

• -11

• 15

• 11

-22 + 6

• -28

• 16

• -16

• 28

-30 - 10

• 40

• -40

• -20

• 20

How do you solve this problem. -6 - (-4). What is the answer?

• subtract it, -10

• change to addition and add. -10

• subtract it, -2

• You change to addition, and change the sign of the second number. Follow integer addition rules. -2

What rule do you use to solve this problem? -6 + 11, then solve the problem

• a negative plus a positive, you subtract and take the sign of the larger number. The answer is 5.

• a negative plus a negative is a bigger negative. The answer is 5