4 Math Tricks That Will Blow Your Mind

4 Math Tricks That Will Blow Your Mind



#1: Guess the number which your friend thought!

Ask your friend to think a number between 1 to 20.

Let's, suppose your friend thought number 7

Now ask him to add the number by 5

i.e. 7+5 = 12

Now multiply the Sum by 3

12*3 = 36

Now Subtract 15 from the result.

36-15 = 21

Ask your friend what number he got, he will say 21

Divide the answer by 3 i.e. 21/3 = 7

Now tell your friend that the number is 7, which he thought!



#2: Multiply any two digits number by 11*

Let suppose you want to multiply 43 and 11

43*11 = ?

Step 1: Add two numbers (43 = 4+3 = 7)

Step 2: Now put 7 in between the two numbers i.e. 4[7]3 = 473



Another example: Let suppose you want to multiply 67 and 11

67*11 = ?

Step 1: Add two numbers (67 = 6+7 = 13)

 Here we got two digits

Step 2: Now put 3 in between the two numbers & add 1 to first digit i.e. 7[3]7 = 737



#3: Guessing Friend's Age

Let's say your friend is 21 years old

Step 1: Multiply the age by 5

21*5 = 105

Step 2: Add 8 to the number you obtained

105+8 = 113

Step 3: Now multiply the result by 2

113*2 = 226

Step 4: Now Subtract 6 from the number you obtained

226-6 = 220

Step 5: Multiply by 10

220*10 = 2200

Step 6: Subtract 100 from this number

2200-100 = 2100

Step 7: Divide the number obtained by 100

2100/100 = 21 Years Old



#4: How to find square of two digits number which ends with 5?

Let's suppose you have to find the Square of 65

(65)^2 = ?

Step 1: Separate the 5 from the rest of the number.

Step 2: Set up the formula x(x+1) [Where x = 6]

i.e. 6(6+1)

Step 3: Multiply the two values together  6*7 = 42

Step 4: Append 25 to the end of the product

Hence your answer is 4225