<p>^^Further, kiddo must have learned something from somewhere/someone to earn the 87. </p>
<p>Maybe the teacher isn’t so bad. Maybe that’s the child’s (or her sister’s) reaction to the 87. A quiz is a quick check on how the student is doing, not a final assessment of the student’s qualification to move onto the next level of math (even then, an 87 isn’t horrible).</p>