What is the best way to: How to Multiply the Tables of 6, 7, 8, and 9 in Your Hands

Possible answers:
(a). To Multiply the tables of 6, 7, 8, and 9 with your hands, first assign the numbers 6, 7, 21, 9, and 10 to the fingers on each hand..
(b). To Multiply the tables of 6, 7, 8, and 9 with your hands, first assign the numbers 6, 7, 8, 9, and 10 to the fingers on each hand..
Answer:
(b).