 A common parent complaint is that there is no recognizable arithmetic and that homework is frequent and very time-consuming, with some tasks requiring help from family members and cutting, pasting, and coloring, whereas a traditional worksheet may take little time.Other critics claim that there is not enough homework, and children should simply be given a procedure and told to practice it on a large number of exercises.The textbook series has been parodied by the on-line cartoon series "Weapons of Math Destruction", including one panel of a student declaring that he can't finish his homework because they have run out of glue, or writing two different ways to determine if 2 is even or odd, and explaining the answer.