PS4.5 Cross Multiplication (SUPER USEFUL)

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syllabus

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- How to Use These Videos
- Step By Step Guide to the Problem Sets
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Problem Set 1: Numbers, Order of Operations
- Order of Operations Worksheet
- PS1.1 Addition in Any Order
- PS1.2 Multiplication with Negatives
- PS1.3 Multiplication Identity and Negation
- PS1.4 Division with Negatives
- PS1.5 Division Identity and Negation
- PS1.6 Example with Mixed Operations
- PS1.7 More Mixed Operations
- PS1.8 Multiplying Repeated Negative Numbers
- PS1 Answer Key
Problem Set 2: Numbers, Distributing, Exponents
- Learning Patterns in Math
- PS2.1 Squares
- PS2.2 Parentheses Prevent Ambiguity
- PS2.3 Cubes
- PS2.4 Powers of Ten
- PS2.5 Powers of Negative Two
- Analogy for Why We Distribute
- PS2.6 Distributing a Negative Sign
- PS2.7 Typical Distribution (IMPORTANT)
- PS2.8 Zero and One to a Power
- PS2.9 Powers Multiplied
- PS2.10 Powers Raised to a Power
- PS2 Answer Key
Problem Set 3: Powers of Ten, Absolute Value & Square Roots
- Scientific Notation
- PS3.1 Scientific Notation Is Powers of Ten
- PS3.2 Negative Powers
- PS3.3 Base for Positive and Negative Numbers
- PS3.4 Converting Simple Numbers to Scientific Format
- PS3.5 The Decimal Point
- PS3.6 Converting General Numbers to Scientific Format
- Two Answers for One Problem
- PS3.7 Absolute Value
- PS3.8 Almost a Real Algebra Problem
- PS3.9 Square Roots
- PS3 Answer Key
Problem Set 4: Fractions the Easy Way
- Fractions, Oh My!
- PS4.1 Negative Exponents Are Fractions
- PS4.2 Exponents that Cancel Out
- PS4.3 How to Multiply Fractions
- PS4.4 Fractions Inside Fractions
- PS4.5 Cross Multiplication (SUPER USEFUL)
- PS4.6 Adding Fractions
- PS4 Answer Key
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