Spring Break Math Practice Buckle Down Lessons 5, 6, 9, 11, & 13
Feb 22, 2016
Spring Break Math Practice
Buckle Down Lessons 5, 6, 9, 11, & 13
Lesson 5: Ratio & Proportion
Ratios can be written in the following ways…6 to 7 6:7 6/7
What is the ratio of butterflies to flowers?
Proportion A proportion compares two
different ratios and shows that they are equal.
8 2 12 3
You can use cross products to determine if they are equal.
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:money2. Multiply cross products3. Solve equation.
Lesson 6: Estimation & Problem Solving
Rounding Whole Numbers & Decimals
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:
Rounding Fractions & Mixed Numbers
Round the following to the nearest whole number!
Solve Problems using Estimation—Use Reading Strategies!!
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?
Lesson 9: Geometric Figures
Please refer to the examples in your packet!
Lesson 11: Measurement Systems
Measuring with Standard Units
What is the measure of the line segment to the nearest fraction of an inch?
Estimating with Standard Units
What is the measure of the line segment to the nearest centimeter?What is the exact measure of the line segment?
Converting Units of WeightCustomary System
144 oz =____lb 5 T = ______lb
2.5 lb = ____ oz
1lb = 16 oz 1T = 2,000 lbs
9 10,000
40
Convert Units of WeightMetric System
Kg hg dag gdg cg mg
4 g = ___ mg 3.5 kg = ____mg
2,500mg = ____g 500g = ____kg
Measure of Central Tendency
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?
Measure of Central Tendency
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, 10What is the median number of customers who ordered pies?
Measure of Central Tendency
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, 4What is the mode of the scores?
Sampling
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!
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 8th grade
math class at a middle school.C. Survey every 5th customer that exits
a grocery store.D. Survey every 10th customer that just
bought a new car.