Optellen en aftrekken (reeks 2)

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

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Verbetersleutel

1. \(-(+4)+(-9)=-4-9=-13\)
2. \(-6-(+2)=-6-2=-8\)
3. \(2-(-8)=2+8=10\)
4. \(-(-11)+(+2)=11+2=13\)
5. \(-(-1)-(+3)=1-3=-2\)
6. \(-(+1)-(-11)=-1+11=10\)
7. \(-(-8)+(+8)=8+8=16\)
8. \(-3-(-6)=-3+6=3\)
9. \(-(-3)-(+5)=3-5=-2\)
10. \(-(+3)+(-3)=-3-3=-6\)
11. \(-(-9)+(+6)=+9+6=15\)
12. \(-(+1)+(-7)=-1-7=-8\)