how can we do addition oraly in abacus
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For example-
1s partner 9,10-1=9
2s partner 8,10-2=8
3s partner7,10-3=7
4s partner 6,10-4=6 and rest do it yourself..........
1s partner 9,10-1=9
2s partner 8,10-2=8
3s partner7,10-3=7
4s partner 6,10-4=6 and rest do it yourself..........
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