Check the charge of a battery
Raise the battery to one or two centimeters on a table and let it fall; if it staggers and falls it has no load.
The Nine Table with Hands
Put your hands with your palms towards you. Assign to each finger of the left hand a number, from 1 to 5, starting with the little finger; and from 6 to 10 to each finger of the right hand starting with the thumb. Now, to multiply, for example, 9 × 7, lower the assigned finger with the number 7; the number of fingers remaining to the left of that finger will be tens, and the number of fingers to the right units. In the example, 9 × 7 = 63.
How to know the degrees of an angle?
Extend your fingers as far as you can and place the palm on a flat surface. The pinky should be at the bottom and represents 0; the thumb represents 90 °, the index 60 °, the medium 45 ° and in the annulus 30 °
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