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1. \(-6-8=\)
2. \(-12-2=\)
3. \(7-8=\)
4. \(-6-1=\)
5. \(-5-4=\)
6. \(-4-8=\)
7. \(4-7=\)
8. \(-12-1=\)
9. \(-6-3=\)
10. \(6-8=\)
11. \(3-12=\)
12. \(-3-1=\)

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Verbetersleutel

1. \(-6-8=-14\)
2. \(-12-2=-14\)
3. \(7-8=-1\)
4. \(-6-1=-7\)
5. \(-5-4=-9\)
6. \(-4-8=-12\)
7. \(4-7=-3\)
8. \(-12-1=-13\)
9. \(-6-3=-9\)
10. \(6-8=-2\)
11. \(3-12=-9\)
12. \(-3-1=-4\)