
Lesson 46 - Estimate Decimal Multiplication
Authored by Kelsey Rawson
Mathematics
5th Grade
CCSS covered
Used 3+ times

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7 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Choose the best estimate by rounding to the nearest one.
37.8 x 1.6
760
76
660
66
Answer explanation
The decimal number 37.8 rounds to 38. The decimal number 1.6 rounds to 2. The estimated product is 76.
Tags
CCSS.5.NBT.B.7
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Choose the best estimate by rounding to the nearest one.
14.5 x 5.5
70
700
900
90
Answer explanation
The decimal number 14.5 rounds to 15. The decimal number 5.5 rounds to 6. The estimated product is 90.
Tags
CCSS.5.NBT.B.7
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Use compatible numbers to estimate the product.
40.55 x 5.6
246
245
200
240
Answer explanation
The number 40 can be easily multiplied by 6, which is what 5.5 rounds to. Multiply 4 x 6 then add a zero: 4 x 6 = 24. The estimated product is 240.
Tags
CCSS.5.NBT.B.7
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Use compatible numbers to estimate the product.
72.8 x 5.7
42
420
45
450
Answer explanation
The number 70 can be easily multiplied by 6. Multiply 7 x 6 then add a zero: 7 x 6 = 42. The estimated product is 420.
Tags
CCSS.5.NBT.B.7
5.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Dad's truck holds 16.5 gallons of gasoline. The cost of gasoline is $3.15 per gallon. About how much money will it cost Dad to fill his tank? Round to the nearest one.
$51
$68
$48
$50
Answer explanation
The decimal number 16.5 rounds to 17. The decimal amount $3.15 rounds to $3. Since 17 x 3 = 51, the estimated product is $51.
Tags
CCSS.5.NBT.B.7
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Choose the best estimate by rounding to the nearest one.
5.7 x 30.30
15
150
18
180
Answer explanation
The decimal number 5.7 rounds to 6. The decimal number 30.30 rounds to 30. The estimated product is 180.
Tags
CCSS.5.NBT.B.7
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Choose the best estimate by rounding to the nearest one.
60.7 x 2.3
122
120
180
183
Answer explanation
The decimal number 60.7 rounds to 61. The decimal number 2.3 rounds to 2. The estimated product is 122.
Tags
CCSS.5.NBT.B.7
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