Adding and Subtracting Decimals with Models

Adding & Subtracting Decimals

​Before we get started...

​Let's do some quick practice on Decimal Place Value!

Multiple Choice

Which of the fraction models below is 3/10?

Multiple Choice

How would you write the decimal ? 
seventy-one and eight hundredths

• 71.8
• 7.18
• 71.08
• 71.008

Multiple Choice

Which of the following is equivalent to 5/100?

• 0.05
• .005
• 0.5
• 5.0

Multiple Choice

 263.709
Which number is in the hundredths place?

• 2

• 9
• 0
• 7

Multiple Choice

In the number below, what place value is the digit 2 in?  
6.3529

• Hundredths
• Thousandths
• Ones
• Tenths

​How to add decimals

1. ​Line up the decimal points

2. ​Place zero(s) in empty spots

3. ​Bring down decimal point

4. ​Add like normal

​How to subtract decimals

1. ​Line up the decimal points

2. ​Place zero(s) in empty spots

3. ​Bring down decimal point

4. ​Subtract like normal

​Now let's do some practice!

​Use the back of your notes paper as scratch paper!

Multiple Choice

Subtract the following:
9.43-3.34

• 12.77
• 6.09
• 6.90
• 60.09

Multiple Choice

55.78 + 4.6 =

• 60.28
• 55.32
• 56.44
• 60.38

Multiple Choice

Add 16.597+5.78

• 21.556
• 22.377
• 23.144
• 22.589

Multiple Choice

Find the difference:

7.05 - 4.6

• 2.45

• 3.65

• 11.65

• 11.45

Multiple Choice

Find the sum:

32.15 + 24.15

• 8.0

• 12.0

• 56.30

• 12.30

Multiple Choice

21 + 4.09 =

• 4.30
• 6.19
• 25.09
• 16.91

Multiple Choice

Find the difference:

80.93 - 68

• 12.93

• 81.61

• 148.93

• 86.13

Multiple Choice

• 11.18

• 7.14

Multiple Choice

• 11.27

• 22.37

Multiple Choice

• 5.41

• 5.39

Multiple Choice

• 1.85

• 2.25