Memorizing the Multiplication Tables to 20

<h1>Memorizing the Multiplication Tables to 20 - That's Just Crazy!</h1>Author: <a title="Brian Foley" href="http://www.articlesbase.com/authors/brian-foley/29522.htm">Brian Foley</a> Do you have a child who needs a confidence-boost in school? Imagine if your child knew the multiplication tables up to 20. It would make him or her seem like a genius compared to most school children who have problems even remembering 7x 8! If you are like most people, you probably think that memorizing the times tables to twenty would be a heck of a chore. It would! It would be crazy!  I feel sorry for anyone who's already done that when they read ahead and learn the method to get the answer to any multiplication problem with whole numbers between 10 and 20, fast, with no need for memorization. They would have saved weeks of boring, rote memorization if they used this method instead.  Here's how you do it: Let's say you are multiplying 12 x 17. Step 1) Add the ones column of either of those numbers to the other number. In this case you could add either 7 + 12 or 2 + 17. (Both would give you the same result, namely 19). Put a zero after it, to get 190.  Step 2) Get the product of the last digits of each of the original numbers (that would be 2 x 7, which would give you 14).  Step 3) Add the two numbers you got. In this case that would be 190 + 14. You'd get 204, and you'd be done, because 12 x 17 = 204.  That's how easy it is, and it works for any numbers between 10 and 20! Try 19 x 14.  1) 19 + 4 = 23. 23 with a zero at the end is 230. 2) 9 x 4 =36 3) 230 + 36 = 266, which is the correct answer. Piece of cake! Please, please, please don't ever write anything down when you do this! It wlll defeat the whole purpose of this method. Writing down things that a child's mind should be able to do is like training yourself to use crutches when you don't need them. The whole point of this is to trust your brain, and learn to do simple math mentally.  Here are some more examples. Once you have practiced them, you should become fast enough to amaze anyone, especially an elementary school teacher. A third-grader should be able to do these with ease in a short time, and become the "Einstein" of his or her class.  18 x 13 15 x 16 19 x 18 17 x 14 12 x 16 You may come across instances where you will have to carry. You will automatically understand how to do that if you pay attention.  Remember, you are trying to boost confidence, and you can't do that unless you have the basics down. With the basic multiplication tables "in your bones," this way to multiply numbers up to 20 can be a "reputation-maker."  Of course, if you or someone you know (your child or student, maybe?) hasn't totally mastered the "multiplication tables," the above method won't do you much good, will it? You'll be happy to know that there is a fool-proof, easy way to teach or learn the basic times-tables in minutes, and it's even easier than the the method for multiplication of 10 through 20. <a href="http://learn2multiply.com" title="Learn to Multiply">Learn to Multiply</a> with this Easy Method, now. About the Author: I'm a professional magician turned guerrilla-math guy. Magic should be used for opening minds to new things. 
My website is <a href="http://mathmojo.com">MathMojo.com</a> and my blog is <a href="http://mathmojo.com/chronicles">the Math Mojo Chronicles</a>Article Source: <a href="http://www.articlesbase.com/">ArticlesBase.com</a> - <a href="http://www.articlesbase.com/k-12-education-articles/memorizing-the-multiplication-tables-to-20-thats-just-crazy-649450.html" title="Memorizing the Multiplication Tables to 20 - That's Just Crazy!">Memorizing the Multiplication Tables to 20 - That's Just Crazy!</a>

Do you have a child who needs a confidence-boost in school? Imagine if your child knew the multiplication tables up to 20. It would make him or her seem like a genius compared to most school children who have problems even remembering 7x 8!

If you are like most people, you probably think that memorizing the times tables to twenty would be a heck of a chore. It would! It would be crazy!

I feel sorry for anyone who's already done that when they read ahead and learn the method to get the answer to any multiplication problem with whole numbers between 10 and 20, fast, with no need for memorization. They would have saved weeks of boring, rote memorization if they used this method instead.

Here's how you do it:

Let's say you are multiplying 12 x 17.

Step 1) Add the ones column of either of those numbers to the other number. In this case you could add either 7 + 12 or 2 + 17. (Both would give you the same result, namely 19). Put a zero after it, to get 190.

Step 2) Get the product of the last digits of each of the original numbers (that would be 2 x 7, which would give you 14).

Step 3) Add the two numbers you got. In this case that would be 190 + 14. You'd get 204, and you'd be done, because 12 x 17 = 204.

That's how easy it is, and it works for any numbers between 10 and 20!

Try 19 x 14.

1) 19 + 4 = 23. 23 with a zero at the end is 230.

2) 9 x 4 =36

3) 230 + 36 = 266, which is the correct answer. Piece of cake!

Please, please, please don't ever write anything down when you do this! It wlll defeat the whole purpose of this method. Writing down things that a child's mind should be able to do is like training yourself to use crutches when you don't need them. The whole point of this is to trust your brain, and learn to do simple math mentally.

Here are some more examples. Once you have practiced them, you should become fast enough to amaze anyone, especially an elementary school teacher. A third-grader should be able to do these with ease in a short time, and become the "Einstein" of his or her class.

18 x 13

15 x 16

19 x 18

17 x 14

12 x 16

You may come across instances where you will have to carry. You will automatically understand how to do that if you pay attention.

Remember, you are trying to boost confidence, and you can't do that unless you have the basics down. With the basic multiplication tables "in your bones," this way to multiply numbers up to 20 can be a "reputation-maker."

Of course, if you or someone you know (your child or student, maybe?) hasn't totally mastered the "multiplication tables," the above method won't do you much good, will it? You'll be happy to know that there is a fool-proof, easy way to teach or learn the basic times-tables in minutes, and it's even easier than the the method for multiplication of 10 through 20. Learn to Multiply with this Easy Method, now.

I'm a professional magician turned guerrilla-math guy. Magic should be used for opening minds to new things.
My website is MathMojo.com and my blog is the Math Mojo Chronicles

Rate this Article:

0 / 5 stars - 0 vote(s)

Re-Publish

Article Source: http://www.articlesbase.com/k-12-education-articles/memorizing-the-multiplication-tables-to-20-thats-just-crazy-649450.html

Related Videos
Related Articles
Ask / Related Q&A

Play

How to Apply a Quick Filter in Access 2007

Play

Building a Multiplication Table - Lesson 39

Play

How to Change Multiple PageFields in Excel

Play

Craft Tables for Kids

Play

MrExcel's Learn Excel #928 - WIIW - Multiple Consolidation

Latest K-12 Education Articles
More from Brian Foley

My Experience of Coaching Mathcounts Math Contest Preparation

By: Frank Ho | 23/11/2009
This article is about comparing the MATHCOUNTS results of students whom I coached in 1999 and 2000, with different methods in a private learning centre - Ho Math and Chess. I feel the main reason of improvements was due to different coaching methods used in these two years. Students want to participate BC MATHCOUNTS as individuals may find this paper resourceful since individual participation is allowed in 2002/2003 in BC, Canada .

My Experience of Coaching Mathcounts Math Contest Preparation

How to Use Chess to Improve Math

By: Frank Ho | 23/11/2009
Some math educators seem to feel math problems can be divided into 2 parts, one is pure computation and the other is problem solving - this claim is evident by examining the textbooks used in schools. When looking at the worksheets offered for elementary students, this seems to be very logic since there is “nothing” could be related to numbers used in the computational problems to enhance thinking ability.

How to find a good math learning center?

By: Frank Ho | 23/11/2009
The most two important ingredients are the teaching material and the instructor. There are many math learning centers who have not developed materials in a systematic and consistent way, they simply collect each tutor's lecture notes and bind them together and call them "the most valuable material developed by a group of outstanding scholars''.

Using Chess to Teach Math in Elementary Schools

By: Frank Ho | 23/11/2009
Chess has been heralded as a miracle to help children develop their math skills. How true is it? After my over 10 years of research and teaching of math, I think the answer is not a simple yes or no, rather it depends on how chess instruction is delivered. If chess is delivered as a pure game and taught in a way that it has nothing to do with math then the impact on math learning is minimum. On the other hand, if chess is integrated into math worksheets then the effect is more significant.

Master Math Basics Before Grade 4

By: Frank Ho | 23/11/2009
There are so many cases in my teaching life, which the students did not master their basics such as addition, subtraction, multiplication or division and then in their later life these unskilled basics have had dramatic impact on their math ability but unfortunately they were not aware of it.

How to Find a Good Vancouver Summer Program on Math

By: Frank Ho | 23/11/2009
We have been running an math specialty learning center in Vancouver for over 10 years and also both of our children went to all kinds of summer programs in Vancouver so we would like to share our own experience on how to find a good summer math camp or math program offered by learning centers in Vancouver. There are a few tale signs one can use to screen summer programs and these earlier warning signs can be used equally to evaluate summer programs offered in other cities as well.

How KenKen Puzzles can Help You Learn Math

By: Brian Foley | 29/04/2009 | K-12 Education
KenKen puzzles are a new and exciting way to learn and teach basic math. KenKen is addictive, inexpensive and easy to learn. And it really does teach math skills in a very effective way.

Learning the Multiplication Tables - Skip Counting by Two and Three

By: Brian Foley | 19/04/2009 | K-12 Education
Skip counting is a great way to start familiarizing a child with multiplication. There a lots of ways to do it, but using normal playing cards has advantages that no other way has. Here's a link to a free video you can view to learn a good way to teach skip counting with playing cards.

Multiplication - Do you I have to show the work?

By: Brian Foley | 17/04/2009 | K-12 Education
The dogma of, "you have to show your work," is generally more harmful than good. Why do schools insist on it?

Multiplication by Two - How to Practice Multiplying With Playing Cards

By: Brian Foley | 11/02/2009 | K-12 Education
A very easy, effective way to learn or teach multiplication by two, using playing cards.

Multiplying by Nine With the Finger Method

By: Brian Foley | 24/11/2008 | K-12 Education
Here's a clear description of an easy way to master the "nine-times-table" immediately, so you'll never have trouble with it again. And there's no memorization!

Multiplication Tables - Better Ways

By: Brian Foley | 19/11/2008 | K-12 Education
Why do so many teachers and parents forbid kids from learning on their fingers? If you use them often enough to learn the simple arithmetical skills, you will automatically memorize those "facts." You will do it by muscle/mind memory. You will make the skills part of you, rather than getting them inculcated from some external "tables."

Memorizing the Multiplication Tables to 20 - That's Just Crazy!

By: Brian Foley | 19/11/2008 | K-12 Education
Learning the multiplication tables to twenty is pretty impressive - but there is a better way than memorizing them. There is a simple way to do it that you can learn in a minute or two.