Why do the following methods work?
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To multiply two numbers on the above list together, touch the corresponding fingers together. For example, to calculate , touch the index finger of your left hand to the middle finger of your right hand.
At and above the index finger on your left hand there are 2 fingers. At and above the middle finger on your right hand there are 3 fingers. Multiply these two numbers together: . The remaining fingers on both hands combined each count 10, and there are 5 of them, for a product of 50. Add 6 and 50 to get the answer: .
Confused? Let's try another one: . Touch the ring finger of your left hand to the index finger of your right hand. Multiplying the number of fingers at and above the touching fingers: . Counting fingers below the touching fingers as tens: 40. Add 8 and 40 to get the answer: 48.