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.
Guidelines to follow when playing the subtracting game
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:
and 1-7 points in 60 seconds: Very well, keep up!
and 7-15 points in 60 seconds: good!
and more than 15 points in 60 seconds: Expert!
and 1-4 points in 60 seconds: Very well, keep up!
and 4-8 points in 60 seconds : Good!
and more than 8 points in 60 seconds: Expert!
and 1-2 points in 60 seconds: Very well, keep up!
and 2-4 points in 60 seconds : Good!
and more than 4 points in 60 seconds: Expert!
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