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Finger theory calculation - 1
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Exercise : try it orally or by sight
(1)
1+3-4
(6)
8 + 1 - 9
(2)
2 + 1 - 2
(7)
4 - 2 + 6
(3)
3 + 1 - 2
(8)
7 - 5 + 2
(4)
5 + 2 - 1
(9)
6 - 1 - 5
(5)
9 - 6 - 3
(10)
2 + 2 + 7
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