Lightning Addition: Master the Art of Mental Math

In summary: Lightning Addition" for a fun activity involving addition and prediction. In summary, the volunteer is given a sheet of paper, pencil, and calculator and instructed to write a series of numbers, with each subsequent number being the sum of the previous two. After adding all ten numbers, the volunteer can predict the total by looking at the list. This activity is a great way to practice addition skills in a fun and engaging way.
  • #1
soroban
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. . . . . Lightning Addition

Give your volunteer a sheet of paper, a pencil and a calculator.
Then give him these instructions.

Number the lines 1 to10.

On the first line, write any one-digit number.
On the second line, write any one-digit number.

On the third line, write the sum of the 1st and 2nd numbers.
On the next line, write the sum of the 2nd and 3rd numbers.
On the next line, write the sum of the 3rd and 4th numbers.
And so on until he has filled the 10 lines.

Have him add the ten numbers on the calculator.

After a glance a his list, you can predict the total.

Secret: Multiply the 7th number by 11.

The reasoning is obvious in the listing.

Let [tex]a[/tex] and [tex]b[/tex] be the first two numbers.

. . [tex]\begin{array}{ccc} 1 & a\\ 2 &b\\ 3& a+b \\ 4 & a+2b \\ 5 & 2a+3b \\ 6 & 3a+5b \\ 7 & 5a +8b & \Leftarrow \\ 8 & 8a+13b \\ 9 & 13a + 21b \\ 10 & 21a+ 34b \\ \hline \text{Total}& 55a+88b &\Leftarrow \end{array}[/tex]

I bet you didn't know that the Fibonacci series
. . could be used for a show-off stunt.
 
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  • #2
soroban said:

. . . . . Lightning Addition

Give your volunteer a sheet of paper, a pencil and a calculator.
Then give him these instructions.

Number the lines 1 to10.

On the first line, write any one-digit number.
On the second line, write any one-digit number.

On the third line, write the sum of the 1st and 2nd numbers.
On the next line, write the sum of the 2nd and 3rd numbers.
On the next line, write the sum of the 3rd and 4th numbers.
And so on until he has filled the 10 lines.

Have him add the ten numbers on the calculator.

After a glance a his list, you can predict the total.

Secret: Multiply the 7th number by 11.

The reasoning is obvious in the listing.

Let [tex]a[/tex] and [tex]b[/tex] be the first two numbers.

. . [tex]\begin{array}{ccc} 1 & a\\ 2 &b\\ 3& a+b \\ 4 & a+2b \\ 5 & 2a+3b \\ 6 & 3a+5b \\ 7 & 5a +8b & \Leftarrow \\ 8 & 8a+13b \\ 9 & 13a + 21b \\ 10 & 21a+ 34b \\ \hline \text{Total}& 55a+88b &\Leftarrow \end{array}[/tex]

I bet you didn't know that the Fibonacci series
. . could be used for a show-off stunt.

fun kindly refer to Fun with maths: October 2014
 

FAQ: Lightning Addition: Master the Art of Mental Math

What is "Lightning Addition: Master the Art of Mental Math"?

"Lightning Addition: Master the Art of Mental Math" is a book that teaches you how to perform addition calculations quickly and accurately in your head. It uses techniques and strategies to improve your mental math skills and make addition easier and faster for you.

Who can benefit from "Lightning Addition: Master the Art of Mental Math"?

Anyone can benefit from "Lightning Addition: Master the Art of Mental Math", but it is especially helpful for students, professionals, and anyone who needs to do quick calculations in their daily life. It can also be useful for individuals who struggle with math and want to improve their skills.

Is "Lightning Addition: Master the Art of Mental Math" suitable for all ages?

Yes, people of all ages can benefit from "Lightning Addition: Master the Art of Mental Math". The book contains techniques and strategies that can be applied by children and adults alike. It is a great resource for anyone looking to improve their mental math skills.

How is "Lightning Addition: Master the Art of Mental Math" different from traditional math textbooks?

"Lightning Addition: Master the Art of Mental Math" focuses specifically on addition and uses unique methods to help you solve problems mentally. It is not a traditional math textbook, but rather a practical guide that teaches you efficient mental math techniques.

Can "Lightning Addition: Master the Art of Mental Math" be used for other types of math calculations?

While the book focuses on addition, many of the techniques and strategies can be applied to other types of math calculations as well. It can help improve your overall mental math skills and make other calculations easier and faster for you.

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