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Math Module 2 Lesson 3 Objective: Count by fives and ones on the number line as a strategy to tell time to the nearest minute on the clock.
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http://www.glencoe.com/sites/common_assets/mathematics/ebook_a ssets/vmf/VMF-Interface.html Note To Teacher: Click on the link above, select third grade and clock manipulative. On the analogue clock show a specific time get the students to write the time in digital format on their whiteboards. Then switch between digital and analogue clock to check answers.
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18 1 Hour Half Hour 24 54 48 42 36 30 60 12 6
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18 Half Hour 24 30 27 12 6 21 15 9 3 Quarter Hour
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18 27 9 Quarter ’til 45 36
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20 1 Hour Half Hour 50 40 10
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There are 12 tables in a cafeteria. Five students sit at each of the first 11 tables. Three students sit at the last table How many students are sitting at the 12 tables in the cafeteria? 555 555 55 5553 ? 5 10 15 20 25 3035 40 45 50 55 There are 58 student in the cafeteria 55+3=58
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Let’s count to five … 1 2 3 4 5! Where are those numbers on our number line? They are in between 0 and 5 … even if we can see them, we can imagine they are there. 0 5 10 152025303540 45 5055 60 0 5 10 152025303540 45 5055 60 (11 X 5) + 3 Let’s mark 58 on our number line. We’ll count by fives to 55 then put in some smaller tick marks to help us find 58. Can we write that process of finding 58 as a multiplication sentence? Yes, we can!!!
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Let’s find 37 minutes, then show it as a multiplication sentence. 0 5 10 152025303540 45 5055 60 (7 x 5) + 2 = 37 0 5 10 152025303540 45 5055 60 (2 x 5) + 3 =13 How about 13 minutes? What TIME did we plot? 7:37 What TIME did we plot? 7:13
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0 5 10 152025303540 45 5055 60 (9 x 5) + 4 = 49 0 5 10 152025303540 45 5055 60 (0 x 5) + 2 = 02 7:49 Plot 49 minutes Plot 2 minutes 7:02
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Problem 3: Count by fives and ones on a clock to tell time to the nearest minute. http://www.glencoe.com/sites/common_assets/mathematics/ebook_a ssets/vmf/VMF-Interface.html
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