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105What is a Ratio?
106Writing Ratios in Different Forms
107Simplifying Ratios
108Part-to-Part vs Part-to-Whole Ratios
109Introduction to Rates
110Unit Rates
111Comparing Rates to Make Decisions
112Converting Rates Between Units
113Solving Rate Problems
114What is a Proportion?
115Cross Multiplication
116Solving Proportions with One Unknown
117Unit Rates in Proportions
118Scaling Up and Down
119Scale Factors
120Maps and Scale Drawings
121Similar Figures and Proportions
122Proportional Relationships in Tables and Graphs
123Real-World Proportion Problems
124Direct Variation
125Inverse Variation
126Joint Variation
127Combined Variation
128Finding the Constant of Variation
129Real-World Direct Variation Problems
130Real-World Inverse Variation Problems
131Mixed Variation Applications

105What is a Ratio?
106Writing Ratios in Different Forms
107Simplifying Ratios
108Part-to-Part vs Part-to-Whole Ratios
109Introduction to Rates
110Unit Rates
111Comparing Rates to Make Decisions
112Converting Rates Between Units
113Solving Rate Problems
114What is a Proportion?
115Cross Multiplication
116Solving Proportions with One Unknown
117Unit Rates in Proportions
118Scaling Up and Down
119Scale Factors
120Maps and Scale Drawings
121Similar Figures and Proportions
122Proportional Relationships in Tables and Graphs
123Real-World Proportion Problems
124Direct Variation
125Inverse Variation
126Joint Variation
127Combined Variation
128Finding the Constant of Variation
129Real-World Direct Variation Problems
130Real-World Inverse Variation Problems
131Mixed Variation Applications

← Mathematics

Lesson 115 of 3,121·3. Ratios, Proportions, and RatesPro lesson

Cross Multiplication

Discover the cross multiplication method to check if two ratios form a proportion and solve for unknowns.

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