Optellen en aftrekken (reeks 2)

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

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Verbetersleutel

1. \(-(-8)+(+6)=+8+6=14\)
2. \(-(-7)-(+4)=7-4=3\)
3. \(-10-(-3)=-10+3=-7\)
4. \(-(+2)+(-6)=-2-6=-8\)
5. \(-(+2)-(-2)=-2+2=0\)
6. \(1-(-5)=1+5=6\)
7. \(-(+7)-(-10)=-7+10=3\)
8. \(8-(-11)=8+11=19\)
9. \(-(-5)-(+4)=5-4=1\)
10. \(-(-3)+(-3)=3-3=0\)
11. \(-(+2)+(-5)=-2-5=-7\)
12. \(-(-10)+(+7)=+10+7=17\)