Review Detail

These books are only sufficient for drill practice of concepts already learned elsewhere in our experience. The teaching was non-existent or just showed you how to operate the problem. It does explain why that method produces the right answer. Kids that just memorize HOW to do the math without actually understanding how it works will forget that how in time. Kids that know that concept inside out and backwards may also forget the actual how in time just as well, but since they know WHY it worked that way, they'll have the tools to sort it out on their own. A kid who only memorized the method and forgot it later is up a creek.