1.  Find each of the following products:

                (f) (–12) × (–11) × (10)        (g) 9 × (–3) × (– 6)

                (h) (–18) × (–5) × (– 4)         (i) (–1) × (–2) × (–3) × 4

                (j) (–3) × (–6) × (–2) × (–1)

Answers (1)

Product of even number of negative integers is an even integer.

(f) \\ (-12) \times (-11) \times (10) =[ -(12\times11)]\times10 = (-132)\times10 = -1320        

(g) 9 \times (-3) \times (- 6) =9 \times [(-3) \times (- 6)] = 9 \times18 = 162             

(h) (-18) \times (-5) \times (-4) = (-18) \times [(-5) \times (-4)] = (-18) \times20 = -360         

(i)

\\ (- 1)\times (-2) \times (-3) \times 4 = [(-1)\times (-2) ]\times [(-3) \times 4] \\ = 2\times (-12) = -24               

(j)

\\ (-3) \times (-6) \times (-2) \times (-1) = [(-3) \times (-6) ]\times [(-2) \times (-1)] \\ = 18 \times2 = 36

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