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Finger theory calculation - 3

 
 
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Exercise : try it orally or by sight
 
(1) 21 + 3 - 24 (6) 78 + 11 - 9
(2) 32 + 11 - 22  (7)  84 - 50 + 5
(3) 37 + 11 + 51 (8) 67 - 52 + 2
(4) 53 + 36 - 68 (9) 36 - 21 - 5
(5) 99 - 66 - 30 (10) 72 + 20 + 7
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