Decimals Review

Decimals Review

How to Add, Subtract, Multiply, and Divide Decimals

Objective

To review adding, subtracting, multiplying, and dividing decimals.

Practice

We will practice adding, subtracting, multiplying, and dividing decimals throughout this lesson, so have a piece of paper and a pencil ready to help you solve the problems! :)

Poll

Which dog are you feeling like today?

• 1-2

• 3-4

• 5-6

• 7-8

• 9

Adding Decimals

LINE UP THE DECIMAL POINTS AND NUMBERS BY PLACE VALUES!!!

Multiple Choice

34.6+2.31=

• 36.91

• 57.7

• 5.77

• 3.691

Multiple Choice

12+1.74

• 19.4

• 1.94

• 13.74

• 1.374

Multiple Choice

17.1+1.71=

• 188.1

• 18.81

• 34.2

• 3.42

Subtracting Decimals

-Remember to line up the decimal places and the numbers by their place value!!

-Add zeros and borrow as needed

-The first number ALWAYS goes on top with subtraction!

Multiple Choice

21.4-4.7

• 1.67

• 17.7

• 16.7

• 1.77

Multiple Choice

32.9-3.29=

• 2.961

• 29.39

• 2.939

• 29.61

Multiple Choice

43-4.89

• 3.811

• 38.11

• 39.89

• 3.989

Multiplying Decimals

-Do NOT have to be lined up by place value!!!

-Multiply normally and add decimals at the END!!!

Multiple Choice

1.5 X 0.7=

• 10.5

• 1.05

• 105

• 1.35

Multiple Choice

1.45 X 2.8

• 4.060

• 40.60

• 4060

• 406.0

Multiple Choice

4.89 X 3.7=

• 18.153

• 180.93

• 181.53

• 18.093

Dividing Decimals

-The first number goes on the INSIDE

-SMILE to move the decimal point on the inside and outside

-BRING UP the decimal point to the quotient

-Divide normally

-THERE ARE NO REMAINDERS! ADD ZEROS TO FIND THE EXACT ANSWER!!

Multiple Choice

5.6 divided by 0.7=

• 0.8

• 8

• 0.7

• 7

Multiple Choice

12 divided by 0.2=

• 6.0

• 60

• 24

• 2.4

Multiple Choice

9.12 divided by 1.2

• 76

• 7.6

• 85

• 8.5

Multiple Choice

62.1 divided by 3.6

• 17.25

• 1.725

• 1.675

• 16.75

Poll

How do you feel about adding, subtracting, multiplying and dividing decimals? (Scale of 1-5)

• 1

  (I want to cry, this is really hard)

• 2

  (It's pretty hard, but I won't cry)

• 3

  (I'm a little confused, but I understand some of it)

• 4

  (I understand most of it)

• 5

  (I could teach this)

THANK YOU!!! :)

• Don't forget to do ALL 3 IXLs for today!!

• J6 to 20

• H3 to 30

• Q2 to 40