Multiplying Decimals
Dividing Decimals
Estimating/Rounding
Multiplication Properties
Powers of Ten
100
0.3 x 0.7
0.21
100
3 / .5
6
100
Use compatible numbers 14.5 / 8
16 / 2 = 8
100
What number is missing and what property is used 9 x 8 x 2 = 9 x __ x 8
2 - Commutative
100
3.1 x 100
310
200
0.5 x 0.2
0.10
200
4 / 0.4
10
200
Round to the ones place $21.24 / 7
$21.00 / 7 = $3.00
200
What number is missing and what property is being used? 32 x ___ = 32
1 - Identitive property
200
4.7 x 10 ^3
4700
300
0.5 x 2
1
300
0.6 / 2
0.3
300
Round to the tens place 43.524 / 5
40 / 5 = 8
300
What number is missing and what property is being used? 6 x (7 x 12) = (____ x 7) x 12
6 - Associative property
300
19.35 / 10
1.935
400
3 x 0.5
1.50
400
0.84 / 4
0.21
400
Use compatible numbers 62.43 / 7
63 / 7 = 9
400
What is associative property
A problem where the two numbers associated with each other in parentheses changes.
400
When I multiply by powers of ten I move the decimal to the ____________
right
500
0.8 x 0.7
0.56
500
When I divide a number by a decimal the number gets A) Smaller B) Bigger C) Stays the same
bigger
500
What are compatible numbers?
Compatible numbers are numbers that are a kind of estimating to make the problem easier in mental math.
500
What is Commutative Property
Commutative property is when the order of the numbers changes but the answer stays the same.
500
When I divide by powers of ten I move the decimal to the _____________
left
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