Math magic/trick

Trick 1: 2's trick
Step1:
Think of a number .
Step2:
Multiply it by 3.
Step3:
Add 6 with the getting result.
Step4:
divide it by 3.
Step5:
Subtract it from the first number used.
Answer: 2

Trick 2: Any Number
Step1:
Think of any number.
Step2:
Double the number.
Step3:
Add 9 with result.
Step4:
sub 3 with the result.
Step5:
Divide the result by 2.
Step6:
Subtract the number with the number with first number started with.
Answer: 3

Trick 3: Any three digit Number
Step1:
Think of any number.
Step2:
Add 7 to it.
Step3:
Multiply the number with 2.
Step4:
subtract 4 with the result.
Step5:
Divide the result by 2.
Step6:
Subtract it from the number started with.
Answer: 5