Most fail this exercise by rushing: What is the result of (6 x 5)

In order to solve a numerical problem, concentration is important and to keep calm during development. When a person hastens, there is a chance that he will perform a bad participation and make a mistake in the result. Do you want to test yourself? Try to develop this math exercise in a time limit.Why are mental calculations essential to boost the brain? Alberto Coto García, one of the most outstanding calculists in history and seven times world…