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→How do we know the student understands?
*addition can be determined if a student gets > 70% of the questions correct on their first attempt.
*addition can be determined if a student gets > 70% of the questions correct on their first attempt.
*subtraction can be determined if for > 70% of the questions the student initially over-paid, they immediately follow up with a correct payment.
*subtraction can be determined if for > 70% of the questions the student initially over-paid, they immediately follow up with a correct payment.
*If a student overpays and then increases their payment, or underpays, followed by an even lower payment it can be inferred the student does not understand the concepts of addition or subtraction.
**If for > 20% of the questions the student makes this mistake. He or she gets a "no" for addition and subtraction.