Optellen en aftrekken (reeks 2)

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

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Verbetersleutel

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