Optellen en aftrekken (reeks 1)

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

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Verbetersleutel

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