5 percent of any number in 4 seconds

You can find 5 percent of any number in 4 seconds using this trick. So what is the trick?

Example #1: 5% of 36

Step 1: Divide 36 by 2.

36/2 = 18 = 18.0

Step 2: Move the decimal point one place to the left. 

1.8

5% of 36 = 1.8

Example #2: 5% of 180

Step 1: Divide 180 by 2.

180/2 = 90 = 90.0

Step 2: Move the decimal point one place to the left. 

9.00

5% of 180 = 9

Example #3: 5% of 13

Step 1: Divide 13 by 2.

13/2 = 6.5 

Step 2: Move the decimal point one place to the left. 

0.65

5% of 13 = 0.65

Example #4: 5% of 650

Step 1: Divide 650 by 2.

650/2 = 325 = 325.0 

Step 2: Move the decimal point one place to the left. 

32.50

5% of 650 = 32.5