Optellen en aftrekken (reeks 2)

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

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Verbetersleutel

1. \(-(+1)-(-7)=-1+7=6\)
2. \(4-(-8)=4+8=12\)
3. \(-(-5)+(-2)=+5-2=3\)
4. \(-(-10)+(+2)=+10+2=12\)
5. \(-(+3)-(-11)=-3+11=8\)
6. \(-(+8)-(-10)=-8+10=2\)
7. \(-(-12)-(+5)=12-5=7\)
8. \(-(+2)+(-2)=-2-2=-4\)
9. \(-(+3)-(-6)=-3+6=3\)
10. \(-(-5)-(+7)=5-7=-2\)
11. \(-(-7)+(+4)=7+4=11\)
12. \(-(-12)+(+8)=12+8=20\)