Optellen en aftrekken (reeks 2)

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

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Verbetersleutel

1. \(-(-11)-(-1)=11+1=12\)
2. \(-(-3)+(-4)=3-4=-1\)
3. \(7-(-10)=7+10=17\)
4. \(-(-12)+(+6)=+12+6=18\)
5. \(-(-5)-(+2)=5-2=3\)
6. \(-(-12)-(-5)=12+5=17\)
7. \(-2-(-7)=-2+7=5\)
8. \(-(+5)+(-9)=-5-9=-14\)
9. \(-(-2)-(-3)=2+3=5\)
10. \(-(-6)+(+8)=+6+8=14\)
11. \(8-(-10)=8+10=18\)
12. \(-(-6)+(-5)=6-5=1\)