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Estimating With Percents

Authored by Anthony Clark

Mathematics

8th Grade

CCSS covered

Estimating With Percents
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15 questions

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1.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Media Image

There are 4 girls in a class of 16 students.  What percent of the class is boys

12%

75%

50%

90%

2.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Choose the best estimate for 66% of $357.99.

$120

$240

$360

3.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Calculate 25% of 80

20

80

48

95

Tags

CCSS.6.RP.A.3C

4.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Neither because 2300 should have been used instead of 2400

Maria is right because finding 10% of 2,400 and multiplying the result three is not a good way to approximate 27% of 2,365

5.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Giselle estimated 165% of 81 by performing these steps. What did she do wrong?

(81)(170%)

=(81)(100% + 70%)

=(81)(100%) + (81)(70%)

=(81)(1.0) + (81)(0.70)

=(81) +(81.70)

She rounded 165% to 170%

She incorrectly multiplied 81 and 0.70

She incorrectly broke up 190% into 100% + 90%

She rounded 81 to 80

6.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

The Romero family dined at Las Burritos and their bill came to $34. They want to leave a 19% tip. This means they will pay 119% of the bill.

Which calculations results in the BEST estimate of the total amount they will pay in dollars? Assume there are no taxes.

(30)(115%)

=30(100% + 15%)

=(30)(100%) + (30)(15%)

=30 + (30)(10%) + 30(5%)

=30 +3.0 + 2.0

=35

(30)(115%)

=30(100% + 15%)

=(30)(100%) + (30)(15%)

=30 + (30)(10%) + 30(5%)

=30 +3.0 + 1.5

=34.5

(30)(120%)

=30(100% + 20%)

=(30)(100%) + (30)(20%)

=30 + (30)(10%) + 30(10%)

=30 +3.0 + 3.0

=36

(30)(120%)

=30(100% + 20%)

=(30)(100%) + (30)(20%)

=30 + (30)(10%) + 30(10%)

=30 +3.0 + 3.0

=39

7.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Which is the BEST estimate of 25% of 239

58

60

50

62

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