Optellen en aftrekken (reeks 2)

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

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Verbetersleutel

1. \(-(-12)+(+5)=+12+5=17\)
2. \(-(+4)+(-11)=-4-11=-15\)
3. \(-(+6)-(-6)=-6+6=0\)
4. \(-(-2)-(+7)=2-7=-5\)
5. \(-(-8)+(+1)=+8+1=9\)
6. \(-(+3)-(-7)=-3+7=4\)
7. \(-7-(-2)=-7+2=-5\)
8. \(-(-2)+(+5)=+2+5=7\)
9. \(-(+5)+(-5)=-5-5=-10\)
10. \(-(-3)-(+1)=3-1=2\)
11. \(-(+4)-(-7)=-4+7=3\)
12. \(3-(-11)=3+11=14\)