Looks like the MAP sample questions are similar to the NAEP (The Nation's Report Card). While it's impressive that a 4th grader can score better than most 8th graders, it's discouraging to see the kinds of questions most 8th graders miss:

Only 35% of 8th graders got this one correct (calculator available).
Quote
Anita is making bags of treats for her sister's birthday party. She divides 65 pieces of candy equally among 15 bags so that each bag contains as many pieces as possible. How many pieces will she have left?
A)33 B)5 C)4 D)3 E)0.33
Only half of 12th graders got this one correct:
Quote
What percent of 175 is 7 ?
A) 4% B)12.25% C)25% D)40%