
Identifying the Counterfeit Coin

Interactive Video
•
Mathematics, Science
•
6th - 10th Grade
•
Hard
Standards-aligned

Sophia Harris
FREE Resource
Standards-aligned
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10 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the main challenge the mathematician faces in the problem?
Counting the total number of coins
Identifying the heaviest coin
Finding the counterfeit coin with limited weighings
Balancing all coins equally
Tags
CCSS.4.MD.A.2
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How are the coins initially divided for the first weighing?
Into four groups of three
Into three groups of four
Into six groups of two
Into two groups of six
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What does it mean if the first two piles on the scale balance?
The counterfeit is among the eight coins on the scale
The counterfeit is among the four coins not on the scale
All coins are real
The counterfeit is heavier
Tags
CCSS.4.MD.A.2
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the purpose of marking coins with a zero, plus, or minus?
To mark the coins that are real
To indicate their weight relative to others
To track which coins have been weighed
To identify the heaviest coin
Tags
CCSS.8.EE.C.7B
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
If two marked coins are weighed and balance, what can be concluded?
The third unweighed coin is counterfeit
All are real
One of them is counterfeit
Both are counterfeit
Tags
CCSS.4.MD.A.2
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the next step if the first weighing does not balance?
Mark the heavier side with a minus
Mark the lighter side with a plus
Mark the heavier side with a plus and the lighter with a minus
Mark all coins with zeros
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the strategy if the previously heavier side remains heavier after reassembly?
The remaining plus coin is heavier
The remaining minus coin is lighter
Either the plus or minus coin is counterfeit
The remaining zero coin is counterfeit
Tags
CCSS.8.EE.C.7B
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