Another problem with almost all worksheets is that they don't prevent incorrect answers. Self_checking worksheets just let the student know they did something wrong__after the fact. I am a firm believer in the concept that, if at all possible, learning should be structured in small chunks in such a way that there is very little possibility for error. Worksheets often allow for mistakes to be made and then to be repeated many times. A mistake that gets practiced is extremely difficult to correct. This especially happens when worksheets are used as time fillers or baby sitters and the work isn't really being supervised.
When I first had my son, I never knew what challenges awaited him in this big world. It started with having to overcome diabetes. This was a long and constant process. It took us about 3 years, but now we have it down to a science. He knows exactly what he needs to do and how to maintain his health. Once we got a system in place it was rather easy for him. Now he is in the third grade and we have hit the second biggest challenge / struggle of his life; math class. This is rather ironic because my husband and I both have Master's degree in engineering and mathematics. We have mastered very highly levels of math with relative ease. My son Cameron on the other hand, struggled to grasp the concept of multiplication. I had to help him find a way to tackle this. I thought to myself, what could I do? Then it hit me, we already developed a strategy that he has mastered to maintain his health. Why not help him develop a strategy to learn math concepts and skills? So I developed this 3 step method that changed everything.