Top 10 Highest IQ Holders in the World

  Top 10 Highest IQ Holders in the World   10. Marilyn Vos Savant (IQ 190) Born in August 11, 1946, Marilyn Vos Savant is an American magazine columnist, author, lecturer and playwright. Having an IQ of about 190,...

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Two-Digit Addition

Two-Digit Addition Our assumption is that you know how to add and subtract one-digit numbers. We will begin with two-digit addition, something I suspect you can already do fairly well in your head. The following exercises are good practice, however, because the two-digit addition skills that you acquire here will be needed for larger addition problems, as well as virtually all multiplication problems in later lessons. This...

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Three-Digit Addition

Three-Digit Addition The strategy for adding three-digit numbers is the same as for adding two-digit numbers: you add from left to right. After each step, you arrive at a new (and simpler) addition problem. Let’s try the following:                                                 473                         +326(300+20+6) Starting...

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INSTANT MULTIPLICATION BY ELVEN

INSTANT MULTIPLICATION BY ELVEN Let’s begin with one of my favorite feats of mental math—how to multiply, in your head, any two-digit number by eleven. It’s very easy once you know the secret. Consider the problem: 32 *11 To solve this problem, simply add the digits, 3+2 =5 put the 5 between the 3 and the 2, and there is your answer:  352 What could be easier? Now you try: 53 *11 Since 5 +3 =8, your answer is...

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