Factors and Multiples L E S S O N 1-1 P A R T 1
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1 Factors and Multiples L E S S O N 1-1 P A R T 1
2 Vocabulary Greatest Common Factor (GCF) the greatest number that is a factor of two or more numbers In other words, ask what is the highest value these numbers have in common?
3 Example 1 1. There are one-slice servings of three types of cake on a table. Each row has an equal number of servings and only one type of cake. What is the greatest number of servings in each row? To solve this problem, use common factors. Factors of 10: 1,2,5,10 Factors of 15: 1, 3, 5, 15 Factors of 20: 1, 2, 4, 5, 10, 20 The GCF of 10, 15, and 20 is 5. So, the greatest number of pieces of cake that can be placed in each row is 5.
4 Got It? a. Lana earned $49 on Friday, $42 on Saturday, and $21 on Sunday selling bracelets. She sold each bracelet for the same amount. What is the most she could have charged for each bracelet?
5 Example 2 Find the GCF of 12 and 18. Factors of 12: 1, 2, 3, 4, 6, 12 Factors of 18: 1, 2, 3, 6, 9, 18 GCF: 6.
6 Got It? b. 12, 66 Find the GCF for each problem. c. 18, 30, 24 d. 20, 32, 36
7 A GCF of 1? Can a GCF ever be 1? Let s take 13 and = 13 x 1 and 17 = 17 x 1 They only have 1 in common
8 Factors and Multiples L E S S O N 1-1 P A R T 2
9 Vocabulary Least Common Multiple (LCM) the least number that is a multiple of two or more whole numbers
10 Example 3 Find the LCM of 2 and 3 Method 1 Use a number line Method 2 Use an organized list. Multiples of 2: 2, 4, 6, 8, 10, 12 Multiples of 3: 3, 6, 9, 12, 15 LCM: 6
11 Example 4 Find the LCM of 14 and 21. Method 3 Write the prime factorization of each number x 2 7 x 3 Multiply using each common prime factor only once. So, the LCM is 7 x 2 x 3 or 42.
12 Got It? 3 & 4 e. 2, 6 Find the Least Common Multiple for each problem. f. 4, 5, 10 g. 3, 5, 7
13 Example 5 Ernesto has painting class every 2 weeks. Kamala has a pottery class every 5 weeks. Ernesto and Kamala met at the art building for class this week. How many weeks will it be until they see each other again? 2: 2, 4, 6, 8, 10, 12, 14, 5: 5, 10, 15, 20, 25, 30, LCM: 10 So, Ernesto and Kamala will see each other again in 10 weeks.
14 In Conclusion: What operation do you think of when finding the GCF? What operation do you think of when finding the LCM?
15 Ratios L E S S O N 1-2
16 Vocabulary ratio - a comparison of two quantities (amounts) by division. Example: A ratio of 2 red paper clips to 6 blue paper clips can be written in 3 ways. 2 2 to 6 2:6 6 Just like fractions, ratios are often expressed in the simplest form.
17 Example 1 Write the ratio in simplest form that compares the number of red paper clips to the number of blue paper clips. Then explain its meaning. Write the ratio as a fraction. Then simplify. 2 6 = 1 3 The ratio is 1/3, or 1 to 3, or 1:3. Explain its meaning = For every 1 red paper clip there are 3 blue paper clips.
18 Got It? 1 Write the ratio in simplest form that compares the number of suns to the number of moons. Then explain its meaning.
19 Example 2 Several students named their favorite flavor of gum. Write the ratio that compares the number who chose fruit to the total number of students. Fruit: 3 Total: = = 1 7 The ratio is 1, 1 to 7, or 1:7. 7 So, 1 out of every 7 students preferred fruit-flavored gum.
20 Example 3 Monday s yogurt sales are recorded in the table. Write the ratio that compares the sales of strawberry yogurt to the total sales. Then explain it s meaning. Strawberry: 8 Total: = 24 What is the ratio? 8 24 = 1 3 So, out of every yogurt cups sold were strawberry.
21 Got It? 2 & 3 A pet store sold the animals listed in the table in one week. Write the ratio of cats to pets sold that week. Then explain its meaning.
22 Example 4 Katy wants to divide her 30 flowers into two groups, so that the ratio is 2 to 3. Step 1: Use a diagram to show a ratio of 2 to Step 2: There are 5 equal sections. So, each section represents 30 5 or 6 flowers. There are 12 flowers in one group and 18 in the other.
23 Got It? 4 Divide 28 cans of soda into two groups so the ratio is 3 to how many boxes = 3. Ratio = blue: red or :
24 Pictures Draw at least two pictures of 1:4. 1. Start with 1:4 that s your first picture.
25 Pictures Draw at least two pictures of 1:4. 2. Copy 1:4 and if you add 1 triangle, you add 4 more clouds.
26 Rates L E S S O N 1-3
27 Vocabulary rate - ratio comparing two quantities (amounts) of different kinds of units. unit rate a rate with a denominator of 1 Example: Desiree typed a text message with 15 characters in 5 seconds. Ratio Rate Unit Rate 15 characters 3 characters 15:5 5 seconds 1 second
28 Vocabulary Continued unit price - the cost per unit (1 item). Example: Rate $36 4 tickets Unit price $9 1 ticket What is the similar between a unit rate and a unit price?
29 1. Rate is a fraction. Things to consider: 2. First number (with label) Second number (with label) EXCEPTIONS: **Time ALWAYS goes on the bottom** AND **Money AWAYS goes on the top**
30 Example 1 Samantha picked 45 oranges in 5 minutes. Write this rate as a unit rate. Write the rate as a fraction. 45 oranges 5 minutes Divide the numerator and denominator by the denominator. 45 oranges 5 = 9 oranges 5 minutes 5 = 1 minute So, the unit rate is 9 oranges 1 minute or 9 oranges per minute.
31 Example 2 The Australian dragonfly can travel 18 miles in 30 minutes. How far can the dragonfly travel in 1 minute? Write the rate as a fraction. 18 miles 30 minutes Since you cannot divide the numerator by the denominator, simplify the fraction.
32 Example 2 Continued Simplify the fraction. 18 miles 6 = 3 miles It can be written as mile to 1 minute. Answer: minutes 6 = 5 minutes 3 miles 5 minutes mile per minute. or as a unit rate of 3 5
33 Got It? 1 & 2 a. Ana downloaded 35 songs in 5 minutes. How many songs did she download per minute? b. Jonathan is baking several loaves of bread to sell in his bakery. He used 9 cups of water and 12 cups of whole wheat flour. How much water was used per cup of flour?
34 Example 3 An adult s heart beats about 2,100 times every 30 minutes. A baby s heart beats about 2,600 times every 20 minutes. How many more beats does a baby s heart beat in 60 minutes than an adult s heart? Step 1: Find the unit rates. Adult: Baby: 2,100 beats 30 minutes 2,600 beats 20 minutes or 70 beats 1 minute or 130 beats 1 minute
35 Example 3 Continued Step 2: Using the unit rates for each, determine the number of beats in 60 minutes. Adult: 70 X 60 = 4,200 beats Baby: 130 X 60 = 7,800 beats Step 3: Find the difference. 7,800 4,200 = 3,600 Answer: 3,600 more times
36 Got It? 3 c. A hummingbird s heart rate while resting is about 7,500 beats every 30 minutes. How many more beats does a hummingbird s heart beat in 60 minutes than a human baby s heart?
37 Example 4 Unit Price Four potted plants cost $88. What is the price per plant? Write the rate as a fraction. $88 Simplify. 4 plants $22 1 plant So, the price per potted plant is $22.00.
38 Homework Question LET S GO OVER #10
39 Ratio Tables L E S S O N 1-4
40 Vocabulary ratio table a table where the columns are filled with pairs of numbers that have the same ratio. equivalent ratios - express the same relationship between quantities. scaling - multiplying or dividing two related quantities by the same number
41 Example 1 To make yellow frosting, you mix 6 drops of yellow food coloring with 1 cup of white frosting. How much yellow food coloring should you mix with 5 cups of white icing to get the same shade? Use a ratio table. Think: What did I multiply 1 by to get to 5? 5 Multiply 6 by 5 to fill in the table Answer: 30 drops
42 Example 2 In a recent year, Joey Chestnut won a hot dog eating competition by eating nearly 66 hot dogs in 12 minutes. If he ate at a constant rate, determine how many hot dogs he ate every 2 minutes. Divide each quantity by one or more common factors until you reach a quantity of 2 minutes. Answer: about 11 hot dogs
43 Got It? 1& 2 a. A patient receives 1 liter of IV fluids every 8 hours. At that rate, find how many hours it will take to receive 4 liters of IV fluids. b. To make cranberry jam, you need 12 cups of sugar for every 16 cups of cranberries. Find the amount of sugar needed for 4 cups of cranberries.
44 Example 3 Cans of corn are on sale at 10 for $4. Find the cost of 15 cans. There is no whole number by which you can multiply 10 to get 15. So, scale back to 5 and then scale forward to 15. First divide by 2, then multiply by 3. In other words, scale back, then scale forward. So, 15 cans of corn would cost $6.
45 Example 4 Joe mows lawns during the summer vacation to earn money. He took 14 hours last week to mow 8 lawns. At this rate, how many lawns could he mow in 49 hours? Is there a whole number by which you can multiply 14 to get to 49? NO So, scale back to 7, then scale forward to 49. Answer: 28 lawns
46 Got It? 3 & 4 A child s height measures 105 centimeters. Estimate her height in inches.
47 Example 5 On her vacation, Leya exchanged $50 American and received $60 Canadian. Use a ratio table to find how many Canadian dollars she would receive for $20 American. Set up a ratio table. Use scaling to find the desired quantity. Answer:$24 Canadian
48 Got It? 5 Lamika buys 12 packs of juice boxes that are on sale and pays a total of $48. Use a ratio table to determine how much Lamika will pay to buy 8 more packs of juice.
49 Explain #6 on the hw
50 Graph Ratio Tables L E S S O N 1-5
51 Vocabulary
52 Vocabulary coordinate plane 2 number lines crossing origin point (0,0) x-axis the horizontal number line y-axis the vertical number line ordered pair - a pair of numbers used to locate a point on the coordinate plane x-coordinate the 1 st # in an ordered pair y-coordinate the 2 nd # in an ordered pair graph to place a dot on a coordinate plane at an ordered pair
53 Example 1 - Table The table shows the cost in dollars to create CDs of digital photos at a photo shop. The table also shows this information as ordered pairs (number of CDs, cost in dollars). Graph the ordered pairs.
54 Example 1- Graph Start at the origin. Use the x-coordinate and move along the x-axis. Then use the y-coordinate and move along the y-axis. Draw a dot at each point.
55 Example 2 - Notes Describe the pattern in the graph. 1. Do the points make a line or curve? The points appear in a line. 2. How much does it go up/down each time? The cost increases by $3 for every CD.
56 Got It? The table shows Gloria s earnings for 1,2, and 3 hours. The table also lists this information as ordered pairs (hours, earnings). a. Graph the ordered pairs. b. Describe the pattern in the graph.
57 Got It? 1. Do the points make a line or curve? 2. How much does it go up/down each time?
58 Example 3 Two friends are making scrapbooks. Renee places 4 photos on each page of her scrapbook. Gina places 6 photos on each page of her scrapbook. Make a table for each scrapbook that shows the total number of photos placed, if each book as 1, 2, 3, or 4 pages. List the information as ordered pairs (pages, photos).
59 Example 4 - Notes Graph the ordered pairs for each friend on the same coordinate plane. 1. Which one is places more photos per page? Gina 2. Which graph is steeper? Gina
60 Need More Practice? (optional) Two friends are each saving money in their bank accounts. Marcus saves $10 each week while David saves $15 each week. a. Make a table for each friend that shows the total amount saved for 1, 2, 3, or 4 weeks. List the information as ordered pairs (weeks, total $ saved). b. Graph the ordered pairs for each friend on the same coordinate plane. c. How do the ratios of Marcus s savings and David s savings compare? How is this shown on the graph?
61 Need More Practice? (optional)
62 Equivalent ratios L E S S O N 1-6
63 Example 1 Is this pair of rates equivalent? Explain by showing work. 20 miles in 5 hours; 45 miles in 9 hours. 1. Write each rate as a fraction. 20 miles 5 hours 2. Then find the unit rates. 20 miles 5 hours 3. Explain. = 4 miles 1 hour 45 miles 9 hours 45 miles 9 hours = 5 miles 1 hour Since the rates do not have the same unit rate, they are not equivalent.
64 Example 2 Is this pair of rates equivalent? Explain by showing work. 3 t-shirts for $21; 5 t-shirts for $ Write each rate as a fraction. $21 3 t shirts 2. Find its unit rate. 3. Explain. $21 = $7 3 t shirts 1 t shirt $35 5 t shirts = $35 5 t shirts $7 1 t shirt Since they have the same unit rate, they are equivalent.
65 Got It? Determine if each pair of rates is equivalent. Explain your reasoning. a. 36 T-shirts in 3 boxes; 60 T-shirts in 6 boxes b. 42 flowers in 7 vases; 54 flowers in 9 vases
66 Example 3 Felisa read the first 60 pages of a book in 3 days. She read the last 90 pages in 6 days. Are these reading rates equivalent? Explain by showing work. Find the unit rates: 60 pages 3 days = 20 pages 1 day 90 pages 6 days 15 pages = 1 day Since the rates do not have the same unit rate, they are not equivalent.
67 Got It? Marcia made 10 bracelets for 5 friends. Jen made 12 bracelets for 4 friends. Are these rates equivalent? Explain your reasoning.
68 Example 4 If you can t find unit rate, use equivalent fractions. Determine if the pair of ratios is equivalent. Explain by showing work. 3 baskets made out of 7 attempts; 9 baskets made out of 14 attempts 1. Write each ratio as a fraction. 3 free throws 7 attempts 2. Make the denominator the same. 9 free throws 14 attempts 3. Explain. 3 free throws 7 attempts = 6 free throws 14 attempts 9 free throws 14 attempts Since the fractions are not equivalent, the ratios are not equivalent.
69 Got It? Mrs. Jeffries has 12 girls out of 16 students on the Student Council. The Earth Day Committee has 4 girls out of 8 students. Are the ratios equivalent? Explain by showing work.
70 Ratio and Rate Problems L E S S O N 1-7
71 Example 1 Heritage Middle School has 150 students. Two out of three students in Mrs. Mason s class gel their hair. Use this ratio to predict how many students in the entire middle school use gel in their hair. Method 1 Use equivalent fractions. 2 =? students who prefer gel total students
72 Example 1- Continued Method 2 Use a bar diagram. How many students will fill in each section, if there are 150 total students? Answer: 100 students
73 Got It? In a survey, four out of five people preferred creamy over chunky peanut butter. There are 120 people shopping at the grocery store. Use the survey to predict how many people in the store would prefer creamy peanut butter.
74 Example 2 The ratio of the number of text messages sent by Lucas to the number of text messages sent by his sister is 3 to 4. Lucas sent 18 text messages. How many text messages did his sister send? Method 1 Use equivalent fractions. 3 4 = 18? (Make sure that the numerators of both fractions are for Lucas) Answer: 24 text messages
75 Example 2 - Continued Method 2 Use a bar diagram. How many text messages are in each section? How many total did Lucas s sister send? Answer: 24 messages
76 Got It? A survey found that 12 out of every 15 people in the U.S. prefer eating at a restaurant over cooking at home. If 400 people selected eating at a restaurant on the survey, how many people took the survey?
77 Example 3 The Millers drove 105 miles on 4 gallons of gas. At this rate, how many miles can they drive on 6 gallons of gas?
78 Got It? There are 810 Calories in 3 scoops of vanilla ice cream. How many Calories are there in 7 scoops of ice cream?
79 Example 4 Jeremy drove his motorcycle 120 miles in 3 hours. At this rate, how many miles can he drive in 5 hours? At what rate did he drive his motorcycle? 120 miles 3 hours =? miles 1 hour 40 miles 1 hour Divide both by 3 to find the unit rate. x 5 hours = 200 miles So, Jeremy can drive 200 miles in 5 hours driving at a rate of 40 miles per hour.
80 Got It? While resting, a human takes in about 5 liters of air in 30 seconds. At this rate, how many liters of air does he take in during 150 seconds?
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