Month in Review – May 2015

Welcome math enthusiasts. Starting this month, we will have our month in review every end of the month.  For those who missed some posts this month, we have learned the following. Math Shortcut: Squaring Numbers from 30 to 50 Math Shortcut: Squaring Numbers from 50 to 70 Mathematical Magic at America’s Got Talent Multiplying Large Numbers […]

Math Shortcut: Squaring Numbers from 30 to 50

In the previous post, we have learned an interesting math shortcut on squaring numbers from 50 to 70. Before we explain why the shortcut works, we first continue this series by learning a shortcut on squaring numbers from 30 to 50. Notice that the steps are almost similar. Example 1: 472 Step 1: First, consider how […]

Mathematical Magic at America’s Got Talent

Last year, there was one episode of mathematical magic at America’s Got Talent. It was supposed to involve one imaginary friend who creates a zodiac calendar based on an audience choice of number. Since it’s hard to explain, just watch and see. Honestly, I have no idea how he did it.  You can share what you […]

Multiplying Large Numbers by 11

The last post about multiplying by 11 only works for two-digit numbers. There’s also a simple trick for multiplying by 11 for larger numbers, and it’s very easy! Let’s have an example of 236 × 11. First, we write the problem like this: 0236 × 11 We write a zero in front of the number […]