Finding a 20% tip no calculator
We have 2 methods to calculate a 20% tip.
Divide by 5
Shift one decimal place left and take the value. Multiply by 2
Example: 180 tip, find a 20% tip:
Method 1:
180/5 = 36
Method 2:
Move decimal place left = 18
Multiply this value by 2: 18 * 2 = 36