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hands PSU

Just knowing the multiplications where both numbers are less than or equal to 5 (easy).

both open hands are placed with little fingers down and fingers are numbered (starting with the pinky) from 6 to 10 (the fat).

They contact the fingers of both hands that represent the numbers we want to multiply.
If, for example, want to do 8 * 7, the heart of the left ring finger on the right.

fingers that are counted are below those in contact and are multiplied by ten. In our example, both little fingers, two ring and left heart are 5, 10, equal to 50.

multiply the fingers of both hands are on top. In other words, fat left index and (2) for fat, heart rate and right (3) equals 6.

both results are added. 50 +6 = 56, which is 8 * 7.

is left as an exercise to know why and how this algorithm.

I have understood that this method was discovered by Napier in the wake of his nephew told him that he could not memorize the tables 6 and above but from 1 to 5 had seemed simple enough, then Neper promised to think about the problem the next day and had devised this method of multiplication with fingers.