Saturday, September 13, 2014

The calculator on the finger tips- Math trick

There is very convenient Math Trick to easily multiply the numbers from 6 to 10 using ones own fingers. We call this, calculator on the finger tip. It is used to teach children to learn tricks about multiplication time tables without any external resources. It also provides our students an opportunity to perfect it, anywhere and anytime just playing with their fingers after learning the trick.  
After teaching this trick in the class, most of the students who have struggled to memorize the times tables before, have admitted it to be very easy for them to calculate. It was amazing to see how handy the fingers are to calculate, besides providing mental calculation opportunity for an individual.
I remember how my students struggled to memorize the times table, especially starting from 6 to 9.  For some, they even took so long to memorize up to 5. Besides, it was of less practical memorizing, when there are gaps of few weeks and few months. The students keep on forgetting and they have to rememorize again (however not so difficult this time).    
So, in the following paragraph I am going to show you the trick. Well, first put your both hands in front of you and ascribe values from 6 to 10 to each finger starting from little finger to thumb. So, the values of  little fingers are 6, 7 for ring fingers, 8 for middle fingers, 9 for forefingers and 10 for thumbs.
How to multiply?
Step 1: Choose the numbers to multiply. For Example: 7x8   
Ste      2: Put together the fingers, whose values you want to multiply. Here, it is ring finger of the left hand and middle finger of the right hand.
Step 3: Now, count the touching fingers and the ones below them. Each of this finger will have the value of 10. So, if there are 5 fingers then the values are five times ten (5*10), which is equal to 50. Mentally retain this number in your head. 
Step 4: Now, multiply the fingers above the ones touching fingers. So, multiply 3 on left hand side with 2 on right hand side. We will get (3*2) 6.
Now mentally add 50 and 6 (50+6), the answer will be 56.
We can use this trick to calculate the times table of 6, 7, 8, 9 and 10, what amongst are the most difficult to calculate and memorize for almost all the students.

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