Item: tModelCommonDifferenceArithmetic3a
Stem:
During their school concerts, a middle school chorus
stands on a set of platforms. Each platform is higher than the one
in front of it so the audience can see all the singers in the chorus.
The first platform, the one closest to the audience, is 6" high. The 5th
platform, the one furthest from the audience, is 22" high. There is
a constant difference in height between each pair of platforms.
How much taller is the 4th platform than
the 3rd platform?
Inputs:
- Answer:
inches
Key:
- Observable: 4.
Score: 1;
Evidence Value: 1.
-
Student:Right!
-
Teacher:The student got this item correct.
- Observable: 18.
Score: 0;
Evidence Value: 0.
-
Student:Good try, but incorrect. That's the height of
the 4th platform, but you needed to figure out how much taller it is than the
3rd platform. The correct answer is 4 inches.
-
Teacher:The student got this item incorrect.
- Observable: 6.
Score: 0;
Evidence Value: 0.
-
Student:Sorry, that was incorrect. That's the height of
the 1st platform, but you needed to figure out how much taller the 4th platform
is than the 3rd platform. The correct answer is 4 inches.
-
Teacher:The student got this item incorrect.
- Observable: .
Score: 0;
Evidence Value: 0.
-
Student:Sorry, that was incorrect. You needed to figure out how much taller the 4th platform
is than the 3rd platform. The correct answer is 4 inches.
-
Teacher:The student got this item incorrect.
Metadata:
Item Node: tModelCommonDifferenceArithmetic3a,
Difficulty: 3.
Proficiencies: ModelArithmetic,
CommonDifference.