Optellen en aftrekken (reeks 2)

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

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Verbetersleutel

1. \(-(-10)+(-4)=+10-4=6\)
2. \(2-(-2)=2+2=4\)
3. \(8-(-12)=8+12=20\)
4. \(7-(-10)=7+10=17\)
5. \(-(+4)+(-4)=-4-4=-8\)
6. \(-(+2)+(-11)=-2-11=-13\)
7. \(-10-(-2)=-10+2=-8\)
8. \(-8-(-6)=-8+6=-2\)
9. \(-(-3)+(+2)=3+2=5\)
10. \(-(+3)+(-6)=-3-6=-9\)
11. \(-(-3)-(-7)=3+7=10\)
12. \(-(-10)-(+8)=10-8=2\)