Find 10% or 20% of a Number - Set 1

Explanation: Since 10% = 0.10 = 1/10, finding 10% of a number is equivalent to finding 1/10 of a number.  An example is 'find 10% of 420' and you can convert the problem to 'find 1/10 of 420' which is simply 42.  Easy!

To find 20% of a number, simply find 10% of the number and double the answer.  An example is 'find 20% of 2000'.  To find 10% of 2000 you can simple drop off a zero, so 10% of 2000 = 200.  Since 20% is twice as large as 10%, then 20% of 2000 = 400.  Easy.  

Examples:

Find 10% of 280.  Answer: 28    Easy!

Find 20% of 480.      Since 10% of 480 = 48, then 20% is twice as large.     20% of 480 = 96   Easy!

Find 20% of 5200     Since 10% of 5200 = 520, then 20% is twice as large.  20% of 5200 = 1040   Easy!

Directions: For each problem in this problem set you will need to identify 10% or 20% of a number.  Strive for being able to accomplish the problems with ease and then strive for speed.  Good luck and enjoy the challenge!