減法
| [0] | (+16) − (-10) | = | |
| [1] | (-9) − (-9) | = | |
| [2] | (+15) − (-8) | = | |
| [3] | (-11) − (-17) | = | |
| [4] | (+18) − (+19) | = | |
| [5] | (+16) − (+7) | = | |
| [6] | (-19) − (+9) | = | |
| [7] | (+17) − (-19) | = | |
| [8] | (-8) − (-15) | = | |
| [9] | (-14) − (-19) | = |
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