Saxon Course 2: Lesson 59 (slides)

Lesson 59

• Adding Integers on the Number Line

​Recall that integers include all the whole numbers and also the opposites of the positive integers (their negatives):

​All numbers on the number line except zero are signed numbers, either positive or negative. Zero is neither positive nor negative. Positive and negative numbers have a sign and a value, which is called absolute value.

​Example 1:

​When we add or subtract directed numbers, we need to pay attention to the signs as well as the absolute values of the numbers. Here's how we use a number line to add or subtract:

​(negative)

​(positive)

​Example 2:

​Extreme Daily Challenge #59