I would teach this clever system to any child--hearing, blind, deaf, dumb, lame, sick, or healthy. It will allow communication with the deaf and gives opportunity to spell. [Note the numbers on the diagram only go up to number 9. Number 10 is shaking the "thumbs-up sign." In **our** numbering system, we do the number 11 by putting up 10 - 1 (10 plus 1 is 11). 12 is 10 - 2, etc. We do the number 20 by putting up 2 and then 10 (using the same hand, the two motion says "two-ten" like in the RightStart mathematics propgram). The number 30 would be 3 - 10, etc. up to 90. For 100 and upward, we use standard sign language symbols: 100 is the C sign, 1,000 is the M sign, 10,000 is the M with a hop forward--each new hop signifies another 1,000. I believe that in standard sign language (there can be some variations), a score (20) is the letter "L"--this is what we use.