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v.1.1
1.3.a1
Name
Guided Practice
Review Practice
Estimate.
1. Estimate the sum by rounding to the
nearest ten.
Estimate.
1. Estimate the sum by applying the
Translation strategy.
62
98
+ 47
389 + 417 + 392 + 406 + 421
41
82
+ 65
2. Estimate the difference by rounding to
the nearest hundred.
2. Estimate the sum by applying the
Compensation strategy.
6,753
-1,739
498 + 387 + 765
9,347
-3,791
3. Estimate the product by applying
Comparison strategy.
3. Estimate the difference by applying FrontEnd strategy.
21 x 5
47,864 – 32,451
Independent Practice
Solve word problems using estimation.
1. John bought a new car. In the first 6
months, he drove 5,726 miles. At this rate,
estimate how many miles he will drive in 1
year.
2. You invite 48 people to a party. You decide for
each person you need two plates, two cups and
three napkins. Estimate how many plates, cups
and napkins you need to purchase from the
store.
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3. Kelly needs 36 inches of material to make
a pair of pants. Estimate how much material
she should buy to make 5 pairs of pants.
4. If you had $280, would you approximately
have enough money to buy a sofa for $219 and a
chair for $44? Show your estimation.
5. Dan uses 4 gallons of paint to cover 1364
square feet of siding. Approximately, how
much siding can Dan paint with 8 gallons of
paint?
6. Rick, Tim, and Steve did yard work for the
neighbor during the summer. Rick earned 139
dollars, Tim earned 227 dollars and Steve earned
158 dollars.
Approximate:
How much more Tim earned than Steve.
How much lesser Rick earned than Tim.
How much the boys earned together.
7. Your salary at Hy-Vee is $450 a month.
Your car insurance of $127, car payment of
$246, and cell phone bill of $86 are all due
this month. Estimate if you will have enough
money to pay your bills.
8. Tom bought 4 CDs. The first CD cost $9.99,
the second and third each cost $11.59 and the
fourth one cost $13.89. Estimate how much
money he spent on CDs.
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v.1.1
Critical Thinking
9. Which is not a definition of Estimation?
A. To calculate approximately (the amount, extent, magnitude, position, or value of
something).
B. To use a calculator to the exact answer.
C. The act of evaluating or appraising.
D. A tentative evaluation or rough calculation, as of worth, quantity, or size.
10. Which estimation strategy would give the best approximation for the equation, 792 + 803 +
789 + 786 + 811?
A. Front-end.
B. Interval estimation.
C. Translation.
D. Compensation.
Match vocabulary with its correct definition.
Vocabulary
Definition
11. Front-End
A. adjust, getting nearer, closer to, better, approaching, update,
amend, improve, revise, modify your estimate, make it bigger,
make it smaller
12. Averaging(cluster) B. estimation of similarities and differences.
13. Rounding
C. grouped about … , all close to, clustered around
14. Interval
D. nearest to
15. Compensation
E. not quite, almost, a little less than, nearly, just about, take just the
first number, cut-off (truncation)
16. Comparison
F. The act of evaluating or appraising, A tentative evaluation or rough
calculation, as of worth, quantity, or size.
17. Translation
G. A value that is nearly but not exactly correct
18. Nice Numbers
H. To change the structure of the problem
19. Approximation
I. between … and … , in the region of
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v.1.1
Answer Key mat_10_1_3_a1_1
Guided Practice
1. Exact: 207. Estimate: 210
Exact: 188. Estimate: 190
2. Exact: 5,014. Estimate: 5,100
Exact: 5,556. Estimate: 5,500
3. The number 21 could be compared to 20. Since 20 x 5 = 100, we estimate that 21 x 5 ≈ 140.
Exact: 105.
Review Practice
1. Exact: 2,025. Estimate: 2,000
2. 500 + 400 + 700 = 1,600
Exact: 1,650
3. Exact: 15,413. Estimate: 15,000
Independent Practice
1. Exact: 11,452. Estimate: 11,400
2. 100 plates, 100 cups, 150 napkins
3. 200 inches of material.
4. $220 + $40 = $260. Yes
5. 2,700 square feet
6. $70
$90
$530
7. $130 + $250 + $90 = $470. No.
8. $48
9. B
10. C
11. E
12. C
13. D
14. I
15. A
16. B
17. H
18. F
19. G
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