Question

# The opposite number of 243 is ______

- 200
- 280
- -243
- -240

Hint:

### Two numbers are said to be opposites of each other, if their sum add up to zero.

## The correct answer is: -243

### Let x be the opposite number of 243. Then, we have: . Solving the equation, we get:

Thus, the value is -243.

Hence, the correct answer is option c.

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