Optellen en aftrekken (reeks 2)

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

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Verbetersleutel

1. \(-(+3)+(-10)=-3-10=-13\)
2. \(-(-7)+(+5)=7+5=12\)
3. \(-(-5)-(+8)=5-8=-3\)
4. \(-(+7)+(-12)=-7-12=-19\)
5. \(-(+5)-(-8)=-5+8=3\)
6. \(-(-12)-(-3)=12+3=15\)
7. \(-(-4)-(+1)=4-1=3\)
8. \(-(-11)-(-1)=11+1=12\)
9. \(-12-(+6)=-12-6=-18\)
10. \(6-(-6)=6+6=12\)
11. \(-(-3)-(-5)=3+5=8\)
12. \(-(-10)-(+1)=10-1=9\)