Optellen en aftrekken (reeks 2)

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

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Verbetersleutel

1. \(-(-10)-(-8)=10+8=18\)
2. \(-(-2)+(+5)=2+5=7\)
3. \(-(-5)+(+7)=+5+7=12\)
4. \(-(-3)+(-4)=3-4=-1\)
5. \(-(-2)+(-1)=+2-1=1\)
6. \(1-(-2)=1+2=3\)
7. \(8-(-12)=8+12=20\)
8. \(-(+5)+(-5)=-5-5=-10\)
9. \(-(+3)+(-9)=-3-9=-12\)
10. \(-(-12)+(-8)=+12-8=4\)
11. \(-(-5)-(-8)=5+8=13\)
12. \(-(+6)+(-8)=-6-8=-14\)