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Finger theory calculation - 2

 
 
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Exercise : try it orally or by sight
 
(1) 10 + 30 - 40 (6) 80 + 10 - 90
(2) 20 + 10 - 20  (7)  40 - 20 + 60
(3) 30 + 10 - 20 (8) 70 - 50 + 20
(4) 50 + 20 - 10 (9) 60 - 10 - 50
(5) 90 - 60 - 30 (10) 20 + 20 + 50
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