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let's Improve your calculating ability by this app!

When a formula is set, choose a correct answer from four numbers!
More difficult calculation is a high score! But it will become a score in half every five seconds, I will calculate quickly and will get a high score!

If "Decimal fraction" is turned ON, the formula in which a decimal is included will also be set to an answer!
If the answer contains a decimal point is up 1.5 times!
Those who want to take a high score, and those who want to challenge difficult calculation will try!