Chapter 3 Rates and Ratios Ratio a comparison

Chapter 3 Rates and Ratios Ratio - a comparison of two numbers or two measurements with the SAME units. Each number in the ratio is calle term. Part-to-Part Ratio- compares two parts of the same whole Write the ratio of red to green blocks 2: 4 Part -to-Whole Ratio- compares a part of the whole to the whole Write the ratio of red blocks to all the blocks 2: 6

When we write ratios, the first term, represents the first description, the second term represents the second description Write the ratio of red to green blocks 2: 6 Page 104

Ratios are like fractions, as in we can have equivalent rati 1 eg 2 = 1: 2 = 4 8 4: 8 1 to 2 = ____ to 8 Equivalent Ratio- a ratio that represents the same relationship as another ratio What is the ratio of blue to total circles 2: 6 or 1: 3

Proportion- a number sequence that shows two equivalent ratios, or fractions 2: 6 2 ___ 6 = 1: 3 = 1 ___ 3

Practice: Josh needs to make a punch for his Christmas party, the recipe is 3 cups of orange juice, and 1 cup of cranberry juice. 1) Write the part-to-part ratio of orange juice to cranberry juice 2) Write a proportion to determine the amount of orange juice to add if he used 4 cups of cranberry juice? 3) Write a proportion to determine the amount of cranberry juice to use if he added 12 cups of orange juice?

Write a part- to-part ratio to compare the items below (first box to the second) The bottom box represents an equivalent ratio, write a proportion that could describe what we did? How many oranges should we put in the missing place? 2: 5 = 4 : 10 Who says you can't compare apples to oranges? page 110 1 -7

Proportion 2 : 5 = 6 : ___ 4 : 7 = 44 : ___ __ : 10 = 50 : 60 Easy, right? Because the ratio's are multiples 2 __ 6 = 3 ____ Try putting the ratio into lowest form 16 ___ = 12 ___ 15 LO WE 5 to 15 = ___ to 9 ST FO RM

An easier way! Cross Multiply and Divide 24 ___ n 1) 2) 3) 24 x = ___ 30 100 x ___ 30 ÷ 100 = 2400 ÷ 30 n = 80

TRY : ___ to 10 = 40 to 25 24: 6 = ___ : 5

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