First, How come no one from my entire grade school career in the public education system, ever told me about mental arithmetic!? Someone? Anyone?<br><br>Second, Why did you teach me to do mathematical calculations back-to-front!? Backwards? The opposite of forwards. Can someone, please, explain this to me?<br><br>This book and the author are beyond brilliant. Of course, any human 3 lbs brain can handle astronomical calculations, you just need to know how to do it and practice it! It's because of mental math and mnemonics I went back to college for an Electrical Engineering degree. And, let me tell you for one of the hardest degrees to pursue, the curriculum is joke when armed with mental math and mnemonic techniques. A joke...just like the teachers' unions and abysmal failure that is our government controlled education system.<br><br>I would augment the Secrets of Mental Math with Arithmetricks. These two books, you'll be able to handle Left-to-Right and micro calculations.
  
Arithmetricks: 50 Easy Ways to Add, Subtract, Multiply, and Divide Without a Calculator