Topic 4: Multiplying Decimals
Presentation
•
Mathematics
•
5th - 6th Grade
•
Medium
+1
Standards-aligned
Brad Drey
Used 8+ times
FREE Resource
4 Slides • 12 Questions
1
by Brad Drey
2
3
What are the powers of 10? Which way do we move the decimal when we multiply by a power of 10?
Solve: 3.45 x 10,000 = ?
Solve: 0.34 x 103 = ?
4
2 Strategies: Rounding or compatible numbers
Estimate the product: 34 x 1.93 = ?
Estimate the product: 126 x 4.2 = ?
5
Poll
Ms.Moore went to the store and bought 9 packs of water bottles for $3.37 each. About how much did she spend?
What should we round $3.37 to.... which is it closest too?
$3.00
$4.00
6
Poll
Ms.Moore went to the store and bought 9 packs of water bottles for $3.37 each. About how much did she spend?
If we round to $3 what should our answer be closer to?
27
36
7
Poll
Ms.Moore went to the store and bought 9 packs of water bottles for $3.37 each. About how much did she spend?
Is this an over or under estimate?
over estimate
under estimate
8
Multiple Choice
You multiply decimals the same way you multiply multi-digit whole numbers.
True
False
9
Multiple Choice
4.183x100=
41.83
418.3
4183
10
Multiple Choice
Sandra can run 6.2 miles in one hour. How many miles could she run in 10 hours?
16.2 miles
62 miles
620 miles
11
Multiple Choice
4.4x3=
7.4
7.7
13.2
132
12
Multiple Choice
10.2x8=
8.16
81.6
816
13
Multiple Choice
33.2x4=
13.28
132.8
1328
13280
14
Multiple Choice
Each math text book weights 1.2 pounds. How much do 32 math books weigh?
33.2 pounds
38.4 pounds
384 pounds
15
Multiple Choice
Michael purchases 12 pencils at the school bookstore. They cost $0.35 each. How much did he spend on pencils?
$3.23
$2.80
$4.20
$30.00
16
Multiple Select
When multiplying decimals do we have to line the decimal up?
Yes always
No not when multiplying
by Brad Drey
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