Optellen en aftrekken (reeks 2)

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

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Verbetersleutel

1. \(-(+3)-(-12)=-3+12=9\)
2. \(-(+3)-(-11)=-3+11=8\)
3. \(-(-1)+(-8)=1-8=-7\)
4. \(-(+1)+(-10)=-1-10=-11\)
5. \(-(-1)-(+7)=1-7=-6\)
6. \(-4-(+8)=-4-8=-12\)
7. \(-(-2)-(-8)=2+8=10\)
8. \(8-(-11)=8+11=19\)
9. \(-(+6)-(-12)=-6+12=6\)
10. \(-(-4)+(+5)=4+5=9\)
11. \(-(-8)-(+8)=8-8=0\)
12. \(5-(-11)=5+11=16\)