Transcript Rounding Whole Numbers and Estimation

This slide show has been created by Heather Hoene at Barrington Elementary School.
Rounding Whole Numbers
And
Estimation
Click here to begin the activity.
These activities will address the following
Hazelwood Objectives for fifth grade.
Explain math concepts and problem
solutions orally and in writing.
Understand concept of rounding whole
numbers and estimation.
Apply problem-solving strategies to
real-world problems.
Whenever you see this picture, you will
need to write the answer in your journal.
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68,242
69,000
68,000
The population of the Sioux Reservation was 68,242.
To the nearest thousand, what was the population?
Explain why you think this.
68,242 is between 68,000 and 69,000,
but it is closer to 68,000.
What digit(s) can help you round to
the nearest thousand?
1) 28,458
2) 28,925
3) 28,512
Round to the nearest thousand.
What digit(s) can help you round to
the nearest thousand?
1) 28,458
2) 28,925
3) 28,512
Round to the nearest thousand.
28,000
29,000
Explain why you think this.
29,000
Round
73,852 to the nearest
1. Ten-thousand.
70,000
2. Thousand.
74,000
3. Hundred.
73,900
4. Ten.
73,850
Explain why you think this.
The Smith family wants to buy a truck that costs
$18,530 and camping trailer that costs $8,427.
Estimate the total$18,530
cost of the truck and the
camping trailer. + $8,427
The exact cost is
18,530
$26,957
Round up
8,427
Round down
$27,000
-$26,957
19,000
+
It is a difference of
8,000
=
27,000
$43.00
Figure the exact cost.
The
total
costdifference?
is about $27,000.
What
is the
Your class is planning on making a pizza.
Below is a list of everything you will need to
buy. About how much money does your class
need to bring to the store?
1
1
1
1
1
1
8 oz. bag of mozzarella cheese
green pepper
medium onion
can of tomato sauce
2 oz. can of mushrooms
package of pizza dough
Estimate!
$8.57
$0.96
$0.33
$4.78
$2.33
$6.99
1
1
1
1
1
1
8 oz. Bag of mozzarella cheese
green pepper
medium onion
can of tomato sauce
2 oz. Can of mushrooms
package of pizza dough
$8.57
$0.96
$0.33
$4.78
$2.33
$6.99
$9.00
$1.00
$0.50
$5.00
$2.50
+ $7.00
Your class will need about $ 25.00.
*There are different ways you can estimate the total
cost. Did you come up with any other ways?
Estimate the number of
bricks used to build this
portion of a chimney.
Answers will vary!
Estimate the number of
bricks used to build this
portion of a chimney.
* 15 Bricks tall
* About 4 bricks long
* About 2 bricks wide
15 x 4 x 2 = 120 bricks
approximately
The end.