Adding Decimals
Subtracting Decimals
Multiplying Decimals
Mixed Decimals
Decimal Representations
100
Do you line up decimals when you add?
yes
100
Do you line up decimals when you subtract?
yes
100
Do you line up decimals when you multiply?
no
100
Solve
$55.65 + $15. 25 =
$70.90
100
What decimal is represented in this picture?
0.4
200
Give directions on how to add these decimals.
1.65 + .23 =
rewrite to line up decimals
add
bring decimal down
200
Give directions on how to solve
50.00 - 15.25 =
rewrite to line up decimals
subtract
bring down decimal
200
Give directions on how to solve
1. 32 x .2 =
rewrite problem - do not line up decimals
multiply and solve
count decimal spaces
200
Solve
$100.00 - $36.99
$63.01
200
What decimal is represented in this picture?
0.33
300
Add
23.99 + 6.99 =
30.98
300
subtract
3.50 - 1.20 =
2.30
300
multiply
4.5 x .3 =
1.35
300
Solve
40.3 x .25
10.075
300
What is the product of this area model problem?
4.7
400
Add
204.15 + 1.29
205.44
400
Subtract
75.88 - 3.44 =
72.44
400
multiply
10.5 x .02 =
0.21
400
solve
3.36 x 4
13.44
400
What multiplication problem and product are represented in the model?
0.12 x 4 = 0.48
500
Add
105 + 54.77 =
159.77
500
subtract
100 - 33.55 =
66.45
500
multiply
4.65 x .5
2.325
500
Put 75.25 in expanded form
70 + 5 + 0.2 + 0.05
OR
(7 x 10) + (5 x 1) + (2 x 0.1) + (5 x 0.01)
500
What multiplication problem and product are represented on the model?
0.2 x 0.5 = 0.10