# What is the answer to (+5)(-4)(+3)(-2)(+1)? Are there any tips or tricks to doing these kinds of problems? Since the multiplication is commutative and associative, you can group the factors of multiplication (the numbers) as you wish, but you need to consider the following rules:

- the multiplication of two positive factors gives a positive result

- the multiplication of two negative factors gives a positive result

-...

Since the multiplication is commutative and associative, you can group the factors of multiplication (the numbers) as you wish, but you need to consider the following rules:

- the multiplication of two positive factors gives a positive result

- the multiplication of two negative factors gives a positive result

- the multiplication of bne negative factor and one positive factor gives a negative result

Since there exists two negative factors and three positive factors, the result will be positive.

Group the terms in this way, such that:

`[(+1)(+3)(+5)]*[(-2)(-4)] = 15*8 = 120`

Hence, evaluating the result of the given multiplication, yields `[(+1)(+3)(+5)]*[(-2)(-4)] = 120` .

Approved by eNotes Editorial Team