Subtracting game

This subtracting game will really help you sharpen your basic mathematics skills. Basically, you have 60 seconds to see how many exercises you can get correctly in 60 seconds.
                                                                


Time left:


         =       


                                               Easy Moderate Difficult



       You got:    points

You should use any means necessary to get the answer, such as mental math, paper and pencils.

However, I strongly recommend that you do not use a calculator!

Keep in mind also that the answer can be negative!

Here is my guideline to verify how well you are doing:

Easy and 1-7 points in 60 seconds: Very well, keep up!

Easy and 7-15 points in 60 seconds: good!

Easy and more than 15 points in 60 seconds: Expert!



Moderate and 1-4 points in 60 seconds: Very well, keep up!

Moderate and 4-8 points in 60 seconds : Good!

Moderate and more than 8 points in 60 seconds: Expert!



Difficult and 1-2 points in 60 seconds: Very well, keep up!

Difficult and 2-4 points in 60 seconds : Good!

Difficult and more than 4 points in 60 seconds: Expert!



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