Question

1000 + __________ = - 1000​

Answer 1

Answer:

-2000 is right answer.

1000 + ( -2000 ) = - 1000

Answer 2

$Let \: the \: unknown \: no. \: be \: \: x$

$Then, \\ \\ 1000 + x = - 1000 \\ \\ x = - 1000 - 1000 \\ \\ \: x = - 2000$

$The \: blank \: should \: be \: filled \: with \: - 2000$