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## Math Tricks To Improve Your Mental Math

Fewer and fewer people are using their mental arithmetic skills these days.

There are various factors that lead to this. One of them is the small price at which it is possible to buy a calculator. Another is the growing number of cell phones that already provide some sort of app that simulates a calculator. That way, there’s always a calculator nearby, so people tend to use that instead of their mental arithmetic skills.

To justify their overuse of the calculator, people often say that it is faster and less error-prone.

However, this is simply not true. It is possible to develop fast and precise mental arithmetic skills. Also, considering the time it takes to reach the calculator and type in the numbers and operations you want, in some situations you will take less time using mental arithmetic.

Contrary to what most people believe, developing fast and accurate mental arithmetic isn’t difficult, and it certainly doesn’t take years to achieve. By learning a few simple math tricks, it is possible to increase your mental arithmetic speed by more than 100%. These math tips explore mathematical properties, which hold under certain conditions. The math tricks vary depending on the math operation used and the numbers involved, and you don’t need more than 10 minutes to learn one.

Let’s see an example of a math trick. Suppose you want to solve **67×11**. Can you solve it in less than 5 seconds? You probably can’t. This is because you don’t yet know a small property of multiplication by 11. The mathematical trick to multiply by 11 is as follows:

Imagine the problem as ** NOT x11**. Now follow the steps:

1) The last digit of the answer is the second digit of *NOT*.

2) The middle digit of the answer is the last digit of the sum of the two digits of *NOT*.

3) The first digit of the answer is the first digit of *NOT* plus the carry if there is one.

Now, let’s apply the steps with our previous example of **67×11**:

1) Last digit: *7*.

2) Middle number: *3*. The sum of the digits of *67* is *6 + 7 = 13*.

3) Last digit: *6 + 1 = 7*. Note that we have a carry because in the previous step we found that the sum of the digits of *NOT* is greater than 10.

So we conclude that **67 x 11 = 737**.

As you can see, this very simple math trick lets you multiply any two-digit number by 11 in less than 5 seconds. And it only took you less than 5 minutes to learn!

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