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Math lessons for the week of Jan 3-6 2012

Math lessons for the week of Jan 3-6 2012. Mrs. Di Todd 5 th grade. Tuesday 1-3-12. Group activity: Show the common factors of 70 and 40: 70 40 Independent activity: Create a Venn diagram of 70 and 40 to display common factors.

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Math lessons for the week of Jan 3-6 2012

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  1. Math lessons for the week of Jan 3-6 2012 Mrs. Di Todd 5th grade

  2. Tuesday 1-3-12

  3. Group activity: Show the common factors of 70 and 40: 70 40 Independent activity: Create a Venn diagram of 70 and 40 to display common factors.

  4. Wednesday 1-4-12 Number Riddle: Clue 1: I am a common factor of 28 and 40. Create factor trees for both numbers. Clue 2: I am an even number. Remove all odd numbers Clue 3: I am not prime. Remove all prime numbers What is the number?

  5. Group activity: Solve each of the riddles below. For each one: • Make a factor tree and list the factor pairs for each number. • Find the factors shared by each number (their common factors). • Use the other clues to find the answer to the riddle. • Show your work. 1. I am a common factor of 27 and 45. I am an odd number. When you multiply me by 3, you get a number greater than 10. What number am I? 2. I am a common factor of 36 and 48. I am also a factor of 30. I am an even number. I am divisible by 3. What number am I? 3. I am a common factor of 60 and 100. I am an even number greater than 4. I am divisible by 4. What number am I?

  6. Independent activity: Write your own factor riddle for a classmate that includes • at least 3 clues. Be sure not to give the answer away before the third clue. • Exchange papers with a classmate and see if you can solve each other’s riddles. Hint: Start with the prime numbers and then multiply different combinations of them to get starting numbers.

  7. Thursday 1-5-12 Finding Simplest Forms Find the simplest form for 5/15 and 6/18. Use your knowledge of prime and composite numbers. There are 3 ways to find simplest forms: 1. Divide by common factors. 2. Find the GCF and divide by GCF. 3. Use a calculator. See text book page 316. Math Idea: You can divide by using common factors until 1 is the only common factor, or you can divide by the GCF one time to write a fraction in simplest form. GCF- greatest common factor

  8. Group: Tell whether the fraction is in simplest form: • 2/6 2. 1/10 3. 8/20 4. 25/32 Name the GCF of the numerator and the denominator. • 18/30 6. 8/24 7. 12/15 8. 50/100 Write each fraction in simplest form. 9. 4/10 10. 12/36 11. 24/32 12. 8/20 Independent: Explain how you would find the simplest form of 16/24 by using both the common factor method and the GCF method.

  9. Friday 1-6-12 Adding and subtracting Fractions • Khan Academy Video: Adding Fractions with Like Denominators • Khan Academy Video: Subtracting Fractions • Virtual Nerd Video: How Do You Add Fractions with the Same Denominator? • Virtual Nerd Video: How Do You Subtract Mixed Numbers with the Same Denominator?

  10. Group Activity: Independent Activity:

  11. Resources: http://qta.quantiles.com/m/resources/downloads/QuantileResource42017.pdf

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