Chemistry Examples

$- 634.9 + - 393.5$

Step 1

Replace all occurrences of $+$ $-$ with a single $-$ . A plus sign followed by a minus sign has the same mathematical meaning as a single minus sign because $1 \cdot - 1 = - 1$

$- 634.9 - 393.5$

Step 2

Subtract $393.5$ from $- 634.9$ .

$- 1028.4$