[Back trick] Calculation trick that can be mentally calculated in 3 seconds! 

Click here for the answer to the bonus question
⇒ • 【中学入試の計算問題】気づけばすぐに解ける分...
If you know the nature of fractions, it is a trick that you can answer in a few seconds.
Before explaining the thumbnail problem, I have included a one-point problem, so please apply it and think about the main subject.
The bonus problem is also a fractional problem, but it is a very interesting problem, so please try it.
#Back trick #Calculation of fractions
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