November 17, 2011 You will need: – Whiteboard/eraser/marker – Math book – Notebook – Calculator Bell Ringer: A number cube is rolled once. Find each probability.

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Presentation transcript:

November 17, 2011 You will need: – Whiteboard/eraser/marker – Math book – Notebook – Calculator Bell Ringer: A number cube is rolled once. Find each probability or find the odds: – A. P(6) – B. P(not 6)

November 18, 2011 You will need: – Math book – Folder/notebook Bell Ringer – A. What is a proportion? – B. If there is one boy to every girl in the school, how many girls would there be if there are 500 boys?

November 21, 2011 You will need: – Math book – Folder/notebook Bell Ringer – A. What is a ratio? – B. Prime factorize 50.

Proportions and Ratio Word Problems Lesson 34

Objectives Form proportions in terms of equivalent fractions. Determine whether relationships are proportional by testing value pairs for a constant ratio. Find missing numbers in a proportion by finding a multiple between the terms of the proportion. Use a ratio table to form and solve a proportion from a word problem.

Proportion Tells us that two ratios are equal. Remember that a ratio is a comparison of two numbers by division. You can check to see if two ratios are equal by reducing each ratio.

Equivalent Fractions We can use cross multiplication (fish hook) to solve for missing parts. – 3/9 = 15/r – x/10 = 16/40 – 6/12 = 3/x – Two pounds of apples cost $3. How much do 6 pounds cost?

Practice Set Pg. 226