9
Welcome to spectacle world!Let's go on an adventure for flash mental arithmetic
Flash mental arithmetic is to calculate mentally.
For example,
"+1" is displayed quickly, so flash.
And "+5", too.
At last "+3".
What's the answer?
Correct answer is "9".
This app is for play flash mental arithmetic to the fullest.
Let's go on an brain adventure!
October 18, 2025
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