### Maths Brain

Although the maths is so simple, people make fun of Algebra.

I have started maths as a brain exercise in the early morning.

And found how to make simple additions.

Don't expect that I will take a class on maths, but want to post the ideas I found.

Psychology:
It is easy to add the numbers than minus the numbers.

Check yourself.

8+9 =
13-8=

Which one you able to find the answer quicly?

Obviously, it could be the addition.

I believe it may be due to we do more additions than minus. So the brain is not trained in it.

First concentrate on hard things:

23-9=?

I did break down this into different ways.

Way 1: Minus the common numbers to make to nearest decimal.
Eg.,
=23-9

=23-(3+6)

=23--3-6

=20-6

=14

Way 2: Minus from the highest order.

Eg.,
=73-26

=70+3-20-6

=70-20 +3-6

=50-3

=47

Way 3: Round off to the nearest decimal

Before going into that, observe this.

9    10     8
7      8     6
____________
2      2      2

If you observe the pattern, the answer would same, if you add +1 above and below for substraction.

So,
= 46 -29 is same as 47-30

Round off by adding +1 and make subtraction easy.

Way 4: Visualization of the whole number and calculating in mind is another way.

=29-18
=11

If the alphabets were converted into the numbers, you can play around with it.

MOBILE - 131529125

Same if the mobile numbers are converted into alphabets, you can learn new words.

9499922234 - idiiibbbcd

Although the addition is easy and comfort for the brain, lets see how we can make it easy for brain.

Way 1 : To the nearest whole number.

=23 + 9

=23 + (7 +2)

=30 + 2

=32

Way 2 : Split into 10's unit and then add.

=73 + 26

=70 + 3 + 20 + 6

=90 + 9

=99

Way 3 : To the nearest whole number.

76 + 43

Let's observe this first

2       3      4
8       7      6
------------------
10   10     10

Hope you found the trick.

For addition, we should add equal no above and minus the same number in the below.

Eg.

73 + 45 is nothing but 70 + 48 or 78 + 40

Let's make our Maths simple.

Multiplication:

Hope you know that multiplication is nothing but an addition.

2 x 3 is nothing but 2 + 2 + 2

So, let's see some tricks around multiplication.

Way 1 : Split method

=14*3

=(10 + 4 ) 3

=30 + 12

=42

Way 2 : Nearest whole method

Hope you know 15 table very much

17 * 3

Since we know 15 * 3 = 45

We have 2 remaining, but we need add 6 to the above 45.