# Grade 6 » The Number System » Apply and extend previous understandings of numbers to the system of rational numbers. » 5

Print this pageUnderstand that positive and negative numbers are used together to describe quantities having opposite directions or values (e.g., temperature above/below zero, elevation above/below sea level, credits/debits, positive/negative electric charge); use positive and negative numbers to represent quantities in real-world contexts, explaining the meaning of 0 in each situation.