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4 1 Proportions

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• 1. Warm Up
• Write in simplest form
• Solve.
• 2. Warm Up
• Write in simplest form
• Solve.
1
• 3. Proportions Some of the most useful items on the math menu Chapter 4.1
• 4. Write 5 to 9
• as a fraction
• as a ratio
• What’s the difference?
• 5. Are They Equal?
• Cross Multiplication
• What is 10 x 5?
• What is 2 x 25?
• If both cross multiplications statements are equal, the fractions are equal.
• 6. Are They Equal?
• Cross Multiplication
• What is 16 x 3?
• What is 4 x 12?
• If both cross multiplications statements are equal, the fractions are equal.
48 48
• 7. Are They Equal?
• Cross Multiplication
• What is 3 x 60?
• What is 4 x 48?
• 8. Find the missing number.
• Using Algebra
• 14 x 35 = 10x
• 9. Rectangle ABCD ~ WXYZ
• Solve for s.
B W D C A X Y Z 9 27 s 25 25 s
• 10. Book Sale
• 4 for \$1.25
• How much is one?
• Label books
• and price
• Set up a proportion.
• Write down labels to help.
• 11. Cross Multiply and divide
• 4 for \$1.25
• How much for one?
• 12. How Tall?
• Man – 6 ft
• Man’s shadow – 9 ft
• Tree’s shadow – 45 ft
• Set up a proportion.
• 13. Proportion
• Man – 6 ft
• Man’s shadow – 9 ft
• Tree’s shadow – 45 ft
• Labels
• Actual Height