Mental Calculation Course - Yusnier Viera

Yusnier Viera mental calculation course.

23 December, 2014 - 03:11
Joined: 6 years 7 months ago


I apologize, but I believe that there is a mistake in the algorithm, please calculate for example 02 Feb 1988, this calculation shows that the day is Wednesday, but actually it is Tuesday.

8 July, 2017 - 06:11
Joined: 1 year 4 months ago

I have a question what if on the end of the number is odd digit when i want mulitplation it by 5

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