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How To Multiply Using Fingers

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Does anyone know/remember how to use fingers to count in Chisombop?
I used this in my classroom about 25 years ago and can't remember how to do it. Help please!

The hands are held in a relaxed posture on or above a table. All fingers are floating off the table to begin with. The fingers are pressed into the table to indicate value.Each finger (but not the thumb) of the right hand has a value of one. Press the index finger of the right hand onto the table to indicate "one." Press the index and long fingers for two, the three leftmost fingers for three, and all four fingers of the right hand to indicate four.The thumb of the right hand holds the value five, like the top bead of a soroban or abacus. To place the value 6, press the right thumb and index finger onto the table. The thumb indicates 5 plus the 1 indicated by the finger.The left hand represents the tens digit. It works like the right hand, but each value is multiplied by ten. Each finger on the left hand represents ten, and the left thumb represents fifty. In this way, all values between 0 and 99 can be indicated on two hands.

How do you take a pulse? I know to use the index finger and it's mate, but what pressure do you put on etc?
And I know to put the fingers- two finger widths apart- up from the wrist. But what else? What pressure? Do we push in with our finger tips? How do we take our own pulse for more than 15 secs or so?

Place your two fingers at the radial pulse on your wrist. You will find it om the thumb side of your wrist, approx. two finger widths down. Apply gentle pressure, until you feel the pulse. If you press to hard you will occlude the pulse, and you won't feel it. To determine your heart rate you cant count for 15 seconds and multiply by 4, or you can count for thirty seconds and multiply by 2, but the most accurate measurement is to count the pulse for a full minute to determine your heart rate. Counting for the full minute allows for more accurate measurement, because of the natural variance in heart rate during a period of time. A normal heart rate for the average person at rest/normal activity is 60-100.

What was the most commonly used base in math for counting?
As today we use 10, what was the most common in the past? I noticed that base 20 was common globally even though many regions were unaware of each other. So was 20 used the most or...? Dan, I meant throughout the entire world, not just Europe.

The ancient Romans used base five (look at how Roman numerals work). They had a method of MULTIPLYING on your fingers.

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