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Detail Form
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1.
(- 1) + ( - 2) = ?
2.
(- 2) + (+ 3) = ?
3.
(- 4) + (+ 3) = ?
4.
(- 1) + (- 1) = ?
5.
(- 1) + (+ 1 ) = ?
6.
(-2) - (- 1) = ?
7.
(- 1) - (- 2) = ?
8.
(- 1) + ? = 0
9.
10 + ? = 0
10.
9 + ? = 9