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Khan Academy on a Stick
Proportion validity example
Understanding Proportions
Ratios and proportions
Introduction to ratios
Ratios as fractions in simplest form
Simplifying rates and ratios
Ratio word problem: boys to girls
Ratio word problem: centimeters to kilometers
Proportion validity example
Solving ratio problems with tables example 1
Solving ratio problems with tables example 2
Solving ratio problems with graph
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