Optellen en aftrekken (reeks 2)

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

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Verbetersleutel

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