Let's Start with the 'Left Side Brain' Exercise:
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
Addition:
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.
Hope you know the answer.
Although the above approaches seems different but the trick is same.
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