Test the Vedic math tricks

In this post, we shall go through few tricks that you can learn here and test yourself in the being developed game. The learning suite will be merged with the game very soon. It is still being developed.

Trick 01 : Square of numbers just below 100
Let us find (x)2. X is just below 100.
Step 01: Find the difference between 100 and this number.
Step 02: Now, Subtract the difference from the number (x).
Step 03: Find x2
Answer = Step 02 | Step 03

Example:
Question: (96)2
Step 01: Difference is 4 (100 - 96 = 4)
Step 02: 96 - 4 = 92
Step 03: (4)2 = 16
Answer = 9216

Trick 02 : Square of numbers just above 100
Let us find (Y)2. Y is just above 100.
Step 01: Find the difference between the number and 100.
Step 02: Now, Add the difference to the number (y).
Step 03: Find y2. Add
Answer = Step 02 | Step 03

Example:
Question: (104)2
Step 01: Difference is 4 (104 - 100 = 4)
Step 02: 104 + 4 = 108
Step 03: (4)2 = 16
Answer = 10816

Trick 03 : Multiply a number by 9
Let us consider xy * 9
Step 01: Think of next number of x.
Step 02: Subtract it from xy
Step 03: Find 10 - y
Answer = Step 02 | Step 03

Example:
Question: 68 x 9
Step 01: Next number to 6 is 7
Step 02: 68 - 7 = 61
Step 03: 10 - 8 = 2
Answer = 612

Trick 04 : Square of any three digit ending with zero in between
Let us find (x0y)2. Digits are referred from left to right.
Step 01: Square third digit (y)2
Step 02: Multiply x with y and double the answer ( x * y * 2 ). The answer is of two digits. Add zero in front, if it is in single digit.
Step 03: Square first digit (x)2
Answer = Step 03 | Step 02 | Step 01 = (x)2 | ( x * y * 2 ) | (y)2

Example:
Question: (504)2
Step 01:  (4)2 = 16
Step 02: 5 * 4 * 2 = 40
Step 03: (5)2 = 25
Answer = 254016

Trick 05 : Multiply any number by 5
For now we will consider only the even numbers. Odd numbers can be taken up a little later.
Step 01: Find the half of the number (Number / 2)
Step 02: Multiply by 10. (Add a zero in the end)

Example:
Question: 64 x 5
Step 01: Half of 64 is 32
Step 02: Multiply 32 by 10. 32 * 10 = 320 (Simply add a zero in the end)
Answer = 320

Trick 06 : Multiply a two-digit number by 11
For any two-digit number. Digits referred from left to right.
Step 01: Add the digits
Step 02: Place the sum in between the digits.

Example:
Question: 43 x 11
Step 01: 4 + 3 = 7
Step 02: Place 7 in between 4 and 3
Answer = 473

Trick 07 : Multiply two digits when the sum of one’s digit is 10.
For any two numbers with the sum of their one’s digit = 10 and have the same number in the ten’s digit.
Step 01: Think of the number (x) next to the number in ten’s digit (y)
Step 02: Find x * y
Step 03: Multiply both numbers’ one digit
Answer = Step 02 | Step 03

Example:
Question: 43 x 47
Sum of one’s digit: 3 + 7 = 10; Ten’s digit in both the numbers = 4
Step 01: Number next to 4 is 5
Step 02: 4 * 5 = 20
Step 03: 3 * 7 = 21
Answer = 2021

Please press "Know the trick" button and use double enter to validate your answer. The development version is available at https://sanjaykumarr.github.io/MindMath/.