Optellen en aftrekken (reeks 2)

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

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Verbetersleutel

1. \(4-(-10)=4+10=14\)
2. \(-(-7)+(-4)=7-4=3\)
3. \(-(+7)+(-12)=-7-12=-19\)
4. \(-(-3)-(-6)=3+6=9\)
5. \(-(-11)-(-8)=11+8=19\)
6. \(-(-7)-(-1)=7+1=8\)
7. \(-(-5)+(+1)=+5+1=6\)
8. \(-(-3)-(+7)=3-7=-4\)
9. \(-12-(-7)=-12+7=-5\)
10. \(-(-12)-(-6)=12+6=18\)
11. \(-8-(+3)=-8-3=-11\)
12. \(-(+2)-(-7)=-2+7=5\)