1. 25/120 2. 28/32 Find the GCF 3. 36 and 72 4. 56 and 88
1. 25/120 2. 28/32 Find the GCF 3. 36 and 72 4. 56 and 88
1. 25/120 2. 28/32 Find the GCF 3. 36 and 72 4. 56 and 88
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W920<br />
Warmup<br />
Write in simplest form:<br />
<strong>1.</strong> <strong>25</strong>/<strong>120</strong><br />
<strong>2.</strong> <strong>28</strong>/<strong>32</strong><br />
<strong>Find</strong> <strong>the</strong> <strong>GCF</strong><br />
<strong>3.</strong> <strong>36</strong> <strong>and</strong> <strong>72</strong><br />
<strong>4.</strong> <strong>56</strong> <strong>and</strong> <strong>88</strong><br />
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Lesson<br />
EQ: How do you use a cake to find <strong>the</strong> LCM?<br />
Goal: <strong>1.</strong>02<br />
21st: Demonstrating ability to work effectivity with diverse<br />
team.<br />
Goals: <strong>1.</strong>02<br />
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N920<br />
Lesson <strong>4.</strong>4<br />
Least Common Multiple<br />
Multiple: A multiple of a number is<br />
<strong>the</strong> product of <strong>the</strong> number <strong>and</strong> any<br />
nonzero whole number.<br />
Example:<br />
2: 2, 4, 6, 8, 10, 12, ...<br />
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Common Multiple: A multiple that is<br />
shared by two or more numbers.<br />
Example:<br />
2: 2, 4, 6, 8, 10, 12, ...<br />
4: 4, 8, 12, 16, 20, ...<br />
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Least Common Multiple: The least of<br />
<strong>the</strong> common multiplies.<br />
Example:<br />
2: 2, 4, 6, 8, 10, 12, ...<br />
4: 4, 8, 12, 16, 20, ...<br />
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Example 1:<br />
<strong>Find</strong> <strong>the</strong> least common multiple of 7 <strong>and</strong> 8.<br />
The LCM of 7 <strong>and</strong> 8 is <strong>56</strong>.<br />
LCM 1x 7 x 8 = <strong>56</strong><br />
<strong>GCF</strong> 1<br />
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Example 2:<br />
<strong>Find</strong> <strong>the</strong> least common multiple of 12 <strong>and</strong> 16.<br />
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Example 3:<br />
<strong>Find</strong> <strong>the</strong> least common multiple of <strong>36</strong> <strong>and</strong> 7<strong>2.</strong><br />
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Example 4:<br />
<strong>Find</strong> <strong>the</strong> least common multiple of 24 <strong>and</strong> 30.<br />
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Example 5:<br />
<strong>Find</strong> <strong>the</strong> least common multiple of 84 <strong>and</strong> <strong>36</strong>0.<br />
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Example 6:<br />
<strong>Find</strong> <strong>the</strong> least common multiple of 2, 6, <strong>and</strong> 1<strong>4.</strong><br />
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92010<br />
Using <strong>the</strong> LCM<br />
David <strong>and</strong> James are running laps on a quarter mile<br />
track. it takes James 3 minutes <strong>and</strong> David 4<br />
minutes to run once around <strong>the</strong> track. They both<br />
start running from <strong>the</strong> starting line at <strong>the</strong> same<br />
time. When will <strong>the</strong>y both be at <strong>the</strong> starting line<br />
again?<br />
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Discussion Questions<br />
How do we use cake to find <strong>the</strong> LCM?<br />
How do we use cake to find <strong>the</strong> <strong>GCF</strong>?<br />
How do we use cake to find <strong>the</strong> Equivalent Fraction?<br />
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Quick Review!<br />
True or False!<br />
<strong>1.</strong> The <strong>GCF</strong> of 14 <strong>and</strong> 21 is 7. Prove!<br />
<strong>2.</strong> The LCM of <strong>25</strong> <strong>and</strong> 70 is 300. Prove!<br />
<strong>3.</strong> The simplest form of 48/<strong>72</strong> is 24/ <strong>36</strong>. Prove!<br />
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Quiz 2: <strong>GCF</strong>, Equivalent Fractions, LCM!<br />
Write out each problem!!! (Make sure you write out <strong>the</strong> letter so we can click it in later!)<br />
<strong>1.</strong> <strong>Find</strong> <strong>the</strong> <strong>GCF</strong> of 24 <strong>and</strong> 63<br />
A. 5 B. 3 C. 504 D. 78<br />
<strong>2.</strong> <strong>Find</strong> <strong>the</strong> LCM of 49 <strong>and</strong> <strong>56</strong><br />
A. 45 B. 67 C. 392 D. 7<br />
<strong>3.</strong> Write <strong>the</strong> fraction in simplest form: <strong>32</strong><br />
<strong>72</strong><br />
A. 4/9 B. 2/8 C. 16/<strong>36</strong> D. 12/47<br />
<strong>4.</strong> Write <strong>the</strong> fraction in simplest form: <strong>28</strong><br />
48<br />
A. 14/24 B. 8/48 C. 7/12 D. 7/48<br />
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Homework tonight! Will be based off how you did on <strong>the</strong><br />
quiz! If you made a 100, <strong>the</strong>n no homework! If you made<br />
below that.. fix your mistake on <strong>the</strong> quiz!<br />
I will check <strong>and</strong> give you extra points on <strong>the</strong> quiz grade!<br />
http://elearningforkids.org/Courses/EN/M1105/index.html<br />
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