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Mixed negatives

Stuck? Read the notes

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Find the answer to all the following calculations, without a calcutator:

1. 18 + (-5)
2. (-54) \div (-6)
3. 14 \times (-9)
4. (-11) - 10
5. (-13) \times 11
6. 19 - (-8)
7. (-8) + 19
8. (-5) - (-4)
9. 108 \div (-18)
10. (-68) \div 17
11. (-15) + (-7)
12. (-10) - (-12)
13. (-12) \times 13
14. 240 \div (-15)

If a = 8,\ b = -20,\ t = -8 , evaluate the expressions below, without a calculator:

t + a

3t

b^{2}

b - a

3a - t

2b + 2t

tab

\displaystyle{\frac{tb}{a}}