Question

What's the Error? Explain the error. Find the correct solution.
19 + (-31) = 12​

Answer 1

The answer is incorrect because 12 should be negative not positive.

Explanation:

1. 19 + -31 = - 12

2. Twelve is negative because if you were to start off at -31 and add 19 the answer would remain negative since -31 in a sense is "bigger" than 19. You would need more of a positive number to make -31 positive such as 40.

40+ -31 = 9