4. Apply and extend previous understandings of addition and subtraction to add and subtract rational numbers; represent addition and subtraction on a horizontal or vertical number line diagram. [7-NS1] a. Describe situations in which opposite quantities combine to make 0. [7-NS1a] Example: A hydrogen atom has 0 charge because its two constituents are oppositely charged. b. Understand *p* + *q* as the number located a distance |*q*| from *p*, in the positive or negative direction depending on whether *q* is positive or negative. Show that a number and its opposite have a sum of 0 (are additive inverses). Interpret sums of rational numbers by describing real-world contexts. [7-NS1b] c. Understand subtraction of rational numbers as adding the additive inverse, *p* - *q* = *p* + (-*q*). Show that the distance between two rational numbers on the number line is the absolute value of their difference, and apply this principle in real-world contexts. [7-NS1c] d. Apply properties of operations as strategies to add and subtract rational numbers. [7-NS1d] |