I am shopping for pre-K and K homeschooling stuff now. I really like the Singapore approach to math and planned on getting the Singapore Essentials workbooks. Then I discovered the Critical Thinking Company online and looked at their samples and fell in love. Thinking back to when I was a child, I did a lot better in school after I started to play logic games. So, the CTC stuff will be supplements. But, are the Singapore Essentials K books the exact same thing as the Math. Reasoning beginning book? I recently bought the older combined Math Reasoning book for $8, so I have it already. Experienced homeschoolers who have seen and/or used both, will the Singapore Essentials be a total duplicate?