Adding and Subtracting Practice

Adding and Subtracting Practice

Adding positive and positive numbers

• 2 + 2 = ?

• both numbers are positive so you add

• 2 + 2 = 4

• both numbers are positive so your answer is positive

Adding positive and negative numbers

• 4 + -2 = ?

• When one number is negative and the other is positive, you will SUBTRACT the smaller number from the bigger number

• 4 - 2 = 2

• To find out if your answer is negative or positive, look at the bigger number in the equation 4 + - 2 =

• The bigger number is 4, and it is positive, so your answer is positive

Adding Positive and negative numbers

• - 8 + 2 = ?

• When one number is negative and the other is positive, you will subtract the smaller number from the bigger number

• 8 - 2 = 6

• To find out if your answer is negative or positive, look at the bigger number in the problem - 8 + 2 = 

• The bigger number is 8 and it is negative, so your answer will be negative

• -8 + 2 = -6

Adding two negative numbers

• - 4 + - 5 =

• When adding two negative numbers, you just add

• 4 + 5 = 9

• Since both numbers are negative, your answer is negative

• - 4 + - 5 = -9

Multiple Choice

4 + 2 =

• 2

• 6

• -6

Multiple Choice

8 + - 2 =

• 10

• 6

• -6

Multiple Choice

3 + - 6 =

• 9

• 3

• -3

Multiple Choice

-5 + 2 =

• 7

• 3

• -3

Subtracting Trick

• Change subtraction problem into addition

• 5 - 7 = 

• change it to 5 + - 7 =

• Since one number is negative and one is positive, you will subtract the smaller number from the bigger one

• 7 - 5 = 2

• Look at the bigger number in the problem 5 + - 7

• 7 is bigger and it is negative so your answer is negative. 5 + - 7 = -2

Multiple Choice

2 - 8 = (remember to change it to an addition problem)

• 6

• -6

• 10