Magic maths or I should say its VEDIC

1. Can you calculate 34 percent of 150 in 1 sec?? NO
I can.
How: simple: My trick---- 34 % of 150 is 150 % of 34, which is 34 + half of 34 i.e 17=51

Trick is:
This is something our teachers never taught us in school, and it would have helped a lot in everyday life -- A% of B = B% of A.

Like multiplication, percentages conform to the commutative principle, which says the order of the terms does
not matter. (Just as 2 x 3 = 3 x 2, it is also true that 40% of 5 = 5% of 40).

2. 75*75 = 5625

75^2 means 75 x 75.
The answer is in two parts: 56 and 25.
The last part is always 25.
The first part is the first number, 7, multiplied by the number "one more", which is 8:
so 7 x 8 = 56
Similarly 85^2 = 7225 because 8 x 9 = 72.

1*1= 1
11*11= 121
111*111= 12321
1111*1111= 1234321

This is actually pascals triangle

4. Divisibility rules:

divisibility by 2: Number ending in 2,4,6,8,0

divisibility by 3: Number whose sum of digits is divisible by 3, ex 12345 is divisible by 3 as sum of digits is 15 or again 1+5=6

divisibility by 4: Number whose last 2 digits are divisible by 4, example 12364756 is divisble by 6.

divisibility by 5: number which ends in 0, or 5.

divisibility by 6: number which is divided by 2 as well as 3.

divisibility by 7: Form the alternating sum of blocks of three from right to left. example 1,369,851: 851 - 369 + 1 = 483 = 7 × 69
or Subtract 2 times the last digit from the rest. 483: 48 - (3 * 2) = 42=7*6 Or, add 5 times the last digit to the rest. 483: 48 + (3 * 5) = 63 = 7 * 9.

divisibility by 8: number whose last 3 digits are divisible by 8 example 12989073896 is divisible by 8 since 896 is divisible by 8

divisible by 9: same for 3 if sum of digits is divisible by 9 then it is divisible by 9, example 127930812984 is divisible by 9 since its sod is 54 or 9

In general a number x is divisible by z if it is divisible by a and b and c... where z= a*b*c

divisibility by 11: if the difference of sum of odd digit in odd place and even place is either 0 or 1 t