Optellen en aftrekken (reeks 2)

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

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Verbetersleutel

1. \(-2-(+1)=-2-1=-3\)
2. \(-8-(-2)=-8+2=-6\)
3. \(-(+8)+(-9)=-8-9=-17\)
4. \(-(+3)+(-6)=-3-6=-9\)
5. \(-(-7)-(+8)=7-8=-1\)
6. \(-(+3)+(-12)=-3-12=-15\)
7. \(-(+4)+(-8)=-4-8=-12\)
8. \(-(+4)+(-7)=-4-7=-11\)
9. \(-(-11)+(+1)=+11+1=12\)
10. \(-(-6)+(-2)=6-2=4\)
11. \(-1-(-2)=-1+2=1\)
12. \(-11-(+6)=-11-6=-17\)