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8/22/2019 d) Multiply Decimals
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DECIMALSRounding Decimals Review
andMultiplying Decimals
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___ , ___ ___ ___ ___ ___ ___ ___
Thousands
Hu
ndreds
Tens
Ones
Tenths
Hundredths
Thou
sandths
TenThousandths
5 1 8 2 1
Read as 518 and 21 hundredths
Decimals are read as and
Rounding Review
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Find the number. Circle it.Look next door.4 or less just ignore.
5 or more add one more.Example: Round 5368 to nearest hundreds.
Circle the 3 in the hundreds place.
Look next door at the 6.It is 5 or more so add 1 more to the
hundreds place.
5368 rounds to 5400
Rounding Review
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Round to the
nearesttenths
2.876
2.9
Round to the
nearest hundredths
31.6999
31.70
Rounding Review
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Round to thenearest tenths
3.478
3.5
Round to thenearest hundredths
22.5972
22.60
Rounding Review
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Steps for Multiplying Decimals
Step 1: Write the problem vertically.
Step 2: Ignore the decimal point(s) and multiply.
Step 3: Determine where the decimal pointgoes in the product.
Place the decimal point in the answerby counting how many places thedecimal point has moved.
Multiplying Decimal
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Multiply 3 x 0.14
0.14 3 x 0.14
=
0.42
Multiplying Decimal
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Multiply 3 x 0.14
2
Step 1: Write the problem vertically0.14
x 3 Step 2: Ignore the decimal pointsand multiply
Step 3: Determine where the decimal
point goes in the product.
The decimal moves two placesto the left
1
40
0.42
Multiplying Decimal
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Multiply 5 x 0.18
0.18 5 x 0.18
=
0.90
Multiplying Decimal
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Multiply 5 x 0.18
0
Step 1: Write the problem vertically0.18
x 5 Step 2: Ignore the decimal pointsand multiply
Step 3: Determine where the decimal
point goes in the product.
The decimal moves two places to the left
4
90
0.90
Multiplying Decimal
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Multiply 0.2 x 0.6
0.2 0.6
=
0.2
Multiplying Decimal
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Multiply 0.2 x 0.6
0.2 0.6
=
0.2 x 0.6
Multiplying Decimal
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Multiply 0.2 x 0.6
0.2 0.6
=
0.2 x 0.6
= 0.12
Multiplying Decimal
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Multiply 0.2 x 0.6
2
Step 1: Write the problem vertically0.2
x 0.6 Step 2: Ignore the decimal pointsand multiply
Step 3: Determine where the decimal
point goes in the product.
The decimal moves two places to the left
10
0. 12
Multiplying Decimal
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Multiply 0.4 x 0.7
0.4 0.7
=
0.4
Multiplying Decimal
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Multiply 0.4 x 0.7
0.4 0.7
=
0.4 x 0.7
Multiplying Decimal
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Multiply 0.4 x 0.7
0.4 0.7
=
0.28
Multiplying Decimal
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Multiply 0.4 x 0.7
8
Step 1: Write the problem vertically0.4
x 0.7 Step 2: Ignore the decimal pointsand multiply
Step 3: Determine where the decimal
point goes in the product.
The decimal moves two places to the left
20
0. 28
Multiplying Decimal
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Multiplying Decimal200
x .250+
5000
0001 004
Move thedecimaltwo placesto the left inyour answer.
.
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Multiplying DecimalHOW MANY DECIMAL PLACES?
1 decimal place3.1
2) (0.4)(2.53)
0.4 2.53
1) 3.1(0.28)
1.012
0.28 2 decimal places0.868 1 + 2 = 3 decimal places
1 decimal place2 decimal places
1 + 2 = 3 decimal places
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Multiplying Decimal1) 0.16
x 30
000 084084
12) 70
x 1.2
041 007048
+
3)
1
0.0048
x 32
690 044635
1
11
2
0
0
1
0
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Evaluate The Power
Anexponent
tells how many times anumber is multiplied by itself.
34
BaseExponent
3 is written as 3 3 3 3 = 814
This exponent is read three to the fourth power.
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Evaluate The Power
Evaluate (0.2)2
4
This means (0.2)(0.2)0.2
x 0.2
The decimal goes moves two places to the left
00
0. 04
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Calculate Area With Decimals
4 in.
0.58in. Area = base x heightMultiply 4 x 0.58
2
0.58
x 4
The decimalmoves two
places to the
left.
3
32
2.32 in2
2
Area is
square units!
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THE END!!!Take out your study guide
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Multiply 0.4 x 0.14
6
Step 1: Write the problem vertically0.14
x 0.4Step 2: Ignore the decimal points
and multiply
Step 3: Determine where the decimal
point goes in the product.
The decimal moves3 placesto theleft.
1
50
0.056
Multiplying Decimals#5
0
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Evaluate The Power
Evaluate (0.5)
2
5
This means (0.5)(0.5)
0.5
x 0.5The decimalmoves two
places to the left. 20
0. 25
#6
2
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2 in.
0.98 in Area = base x height
# 7
Multiply 2 x 0.98
6
0.98
x 2
The decimal
moves two
places to theleft.
1
91
1.96 in2
1
Area is
square units!
TheArea(A)is the number ofsquare units
needed to cover a figure.