Estimating With Percents
Authored by Anthony Clark
Mathematics
8th Grade
CCSS covered
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15 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
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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