Optellen en aftrekken (reeks 2)

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

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Verbetersleutel

1. \(4-(-10)=4+10=14\)
2. \(-(-7)+(+4)=+7+4=11\)
3. \(3-(-6)=3+6=9\)
4. \(-(-1)+(-8)=+1-8=-7\)
5. \(-(-10)+(+5)=10+5=15\)
6. \(-(+8)+(-9)=-8-9=-17\)
7. \(-(-10)-(+8)=10-8=2\)
8. \(-(+7)-(-8)=-7+8=1\)
9. \(-(-10)+(+2)=+10+2=12\)
10. \(-(+3)+(-3)=-3-3=-6\)
11. \(-(+5)+(-10)=-5-10=-15\)
12. \(-2-(+1)=-2-1=-3\)