PRE-ALGEBRA

Lesson 1-4 Warm-Up

PRE-ALGEBRA “Integers and Absolute Value” (1-4) What is are “integers”? How can you compare the order of numbers? What are “opposites”? What is “absolute value”? integer: all of the positive and negative whole numbers, including zero Example: To compare numbers, put them on a number line. Numbers on the right are always bigger than numbers on the left. You can also write them all in decimal form and compare the place values from largest to smallest. Example: opposites: Two numbers that are the same distance from zero on a number line or in “opposite” directions from zero Example: absolute value: a numbers distance from zero shown by surrounding the number with these absolute value brackets | | Example: |-3| and |3| both have an absolute value of 3 (both are opposites that are 3 away from 0); |-24| and |24| both have an absolute value of 24 (both are 24 away from 0)

PRE-ALGEBRA “Integers and Absolute Value” (1-4) How do you simplify an absolute value expression? Example: Simplify 14 - |9 + 4|. 1

PRE-ALGEBRA Graph 2, –2, and –3 on a number line. Order the numbers from least to greatest. The numbers from least to greatest are –3, –2, and 2. Integers and Absolute Value LESSON 1-4 Additional Example

PRE-ALGEBRA Use a number line to find |–5| and |5|. |–5| = 5 |5| = 5 Integers and Absolute Value LESSON 1-4 Additional Example

PRE-ALGEBRA Simplify 9. | – | 11 – 7 = | | – | 9 9 – 4 | Work within grouping symbols. 9 – 4 = Find the absolute value. = 5 Simplify. Integers and Absolute Value LESSON 1-4 Additional Example

PRE-ALGEBRA Write an integer to represent each situation. 1.a debt of $50 2.a dive of 23 feet below the surface Simplify. 3.| –12 |4. | 8 4 | 2 12 –50 –23 – – – –6 Integers and Absolute Value LESSON 1-4 Lesson Quiz