• ### Unit 1: Review of Numbers and Operational Expressions

This unit reviews different basic mathematical concepts and skills necessary before achieving mastery in Algebra, Geometry, and Statistics. Before starting any of the other units in this course, you should already be able to identify real numbers and their locations on the number line, solve problems using four operations with rational numbers, and interpret expressions involving the order of operations. To test your grasp of these concepts, do the practice activities in this unit and complete the unit assessment. These are ungraded opportunities to check your understanding.

Completing this unit should take you approximately 3 hours.

• ### 1.1 Whole Numbers, Integers and Absolute Value

In this section, you will review the basic operations with whole numbers and integers.

• ### 1.2: Factors and Multiples, Prime and Composite Numbers, and Divisibility Rules

In this section, you will review the definition of factors, multiples, and prime and composite numbers.

• ### 1.3: Fractions, Decimals, and Percentages

In this section, you will review fractions, decimals, and percentages.

• ### 1.4. Real Numbers: Rational and Irrational

In this section, you will review the two groups of real numbers: rational and irrational.

• ### 1.5: Exponents and Scientific Notation

In this section, you will review scientific notation, which takes an exponent and uses it to write numbers compactly.

• ### 1.6: Operations with Rational Numbers

In this section, you will review the order of operations.

• ### 1.7: Word Problems

In this section, you will review real-world applications of operations with rational numbers, including word problems with fractions and decimals and various applications of percentages.