Understanding Proportions Notes
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Understanding Proportions Notes
📚 Key Definitions and "I Can" Statements
Ratio: A comparison of two quantities (Example: 2:4 or 2/4)
Proportion: Two ratios that show the same relationship
Example: 1/2 = 2/4 (This IS a proportion because both ratios are equal)
🔍 Identifying Proportions - Cross-Multiplication Method
Step 1: Write the two ratios as fractions
Step 2: Cross-multiply (multiply diagonally)
Step 3: If the products are equal, it's a proportion!
Cross-multiply: 2 × 6 = _____ and 3 × 4 = _____
Since 12 = 12, this _____ a proportion. (Circle: IS or IS NOT)
🌟 Real-World Proportions and Reflection
• Recipes (2 cups flour for 1 cake = 4 cups flour for 2 cakes)
• Maps (1 inch = 10 miles)
• Shopping (3 apples for $2 = 6 apples for $4)
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