2.  Ratios can be written in the following ways… 6 to 76:76/7 What is the ratio of butterflies to flowers?

3.  A proportion compares two different ratios and shows that they are equal. 82 123 You can use cross products to determine if they are equal.

4. A proportion can be used to find the missing value in a problem-solving situation. A variable is a letter that can be used to represent the missing value. Pencils are on sale, 3 for 36 cents. How much money does Elysa need to buy 6 pencils? 1. Set up proportion using pencils:money 2. Multiply cross products 3. Solve equation.

6.  Look at the digit to the RIGHT of the place to which you are rounding. › If the digit is 5 or more, increase the rounding digit by 1 › If the digit is less than 5, leave the rounding digit the same › Change all digits to the right to zeros Round 7,152 to the following places: Nearest ten: Nearest hundred: Nearest thousand:

7.  Round the following to the nearest whole number!

8. Agnes and Malcom just moved into a new apartment. They bought a sofa for $826.75, a recliner for $372.54, and a TV for $1,089.67. About how much money did they spend altogether?

9.  Please refer to the examples in your packet!

11. What is the measure of the line segment to the nearest fraction of an inch?

12. What is the measure of the line segment to the nearest centimeter? What is the exact measure of the line segment?

13. 144 oz =____lb5 T = ______lb 2.5 lb = ____ oz 1lb = 16 oz1T = 2,000 lbs 9 10,000 40

14. Kghgdag gdgcgmg 4 g = ___ mg3.5 kg = ____mg 2,500mg = ____g500g = ____kg

15. Mean: The sum of the numbers in a data set divided by how many numbers there are in the set. A bookcase has 5 shelves with 38, 42, 47, 36, and 37 books on them. What is the mean number of books per shelf?

16. Median: The middle number in a data set arranged from least to greatest. The following list shows the number of customers who ordered pie at Ma and Pa’s Diner each day last week. 8, 11, 7, 20, 13, 7, 10 What is the median number of customers who ordered pies?

17. Mode: The number that appears most often in a data set. Steve played nine holes of golf and shot the following scores: 4, 5, 4, 6, 3, 7, 4, 5, 4 What is the mode of the scores?

18. Sample: A set of data taken from a population (large group) and used to make predictions about the data as a whole. Random Sample: Represents as close as possible the characteristics of the entire population. Biased Sample: Does not represent the entire population. Biased is Bad!

19. An automotive company wants to find out what feature would lead people to buy a car. Which of the following samples would best represent the entire population? A. Survey people that are not interested in buying a new car. B. Survey 4 students in each 8 th grade math class at a middle school. C. Survey every 5 th customer that exits a grocery store. D. Survey every 10 th customer that just bought a new car.