Question

(-1) (-7) 7 0 is equal to


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Answer 1

Answer:

In questions which involve a chain of operations including multiplication by zero, many who are arithmetically competent slip up by failing to correctly apply the correct priorities to operations.

In this question the operations are addition, subtraction, multiplication and division. Addition and subtraction have equal status as the effect of subtraction of value V is identical to adding the negative value of V, i.e., -V. Similarly, multiplication and division have equal status as the effect of dividing by value Q is identical to multiplying by the reciprocal of Q, i.e., 1/Q. The final point to make in this preamble is to remind that multiplication and division are of higher priority than addition and subtraction.

So, with 7 - 1 x 0 + 3 / 3, the multiplication and division must be done first. To clarify this I re-write the numbers and their operations with added brackets (parenthesis) to indicate the multiplication and division which should be done first:

7 - (1 x 0) + (3 / 3) = 7 - 0 + 1 = 8

The answer is 8.