Estimation Estimation

Compatible NumbersCompatible Numbers

Numbers that are close to the numbers in Numbers that are close to the numbers in the problem, and they can help you do the problem, and they can help you do math mentally.math mentally.Ex: 13 – 10Ex: 13 – 1017 – 2017 – 20

1.1. Estimate 2,469 to the nearest THOUSANDEstimate 2,469 to the nearest THOUSAND

2. 2. Estimate 483 to the nearest HUNDREDEstimate 483 to the nearest HUNDRED

3.3. Estimate 262,063 to the nearest Estimate 262,063 to the nearest

HUNDRED-THOUSANDHUNDRED-THOUSAND

4. 4. Estimate 8,437 to the nearest THOUSANDEstimate 8,437 to the nearest THOUSAND

5. 5. Estimate 2,982,539 to the nearest MILLIONEstimate 2,982,539 to the nearest MILLION

6. 6. Estimate 761,658 to the nearest Estimate 761,658 to the nearest

TEN-THOUSANDTEN-THOUSAND

DirectionsDirections: Determine whether the answer : Determine whether the answer given for each problem is reasonable. given for each problem is reasonable. State your reason why or why not.State your reason why or why not.

1.1. Estimate: 81 x 5 = 400Estimate: 81 x 5 = 400

2. Estimate: 58 x 5 = 2502. Estimate: 58 x 5 = 250

3. Estimate: 451 x 7 = 2,8003. Estimate: 451 x 7 = 2,800

4. Estimate: 65 ÷ 9 = 54. Estimate: 65 ÷ 9 = 5

5.5. Kate earns $5 per hour babysitting. If Kate earns $5 per hour babysitting. If she she baby-sits for 4 hours on Saturday and 3 baby-sits for 4 hours on Saturday and 3 hours on Sunday, she says she’ll earn hours on Sunday, she says she’ll earn $12.$12.

6. 6. The 192 Minutemen will take buses from The 192 Minutemen will take buses from Lexington to Concord to perform. Each Lexington to Concord to perform. Each

bus holds 48 Minutemen. Fran estimated bus holds 48 Minutemen. Fran estimated that they needed 4 buses.that they needed 4 buses.

7. 7. One of the world’s fastest trains One of the world’s fastest trains averages averages 132 mi/h. About how far could it 132 mi/h. About how far could it travel in 5 travel in 5 hours?hours?

8. If a donut machine can make 504 donuts in one hour, about how many donuts can it make in 5 hours?

9. Twenty-six families each bring a dozen cookies to share at the June 10th picnic. What is the reasonable estimate of how many cookies that is in all?

10. Ella orders 1,944 rolls for the barbeque sandwiches for the picnic. The rolls come on trays with 36 rolls on a tray.

About how many trays of rolls does Ella order?

11. A total of 30 packages were mailed at a post office on Saturday. The cost for each package was between $5.55 and $6.30. Which best represents the total cost for the packages mailed on

Saturday?

F more than $300

G between $200- $300

H between $100 and $200

J less than $100