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Divisibility

Divisibility. Everyday Math Lesson 1.5. Lesson Objectives. I can find the factors of a number. I can explore relationships between the operations of multiplication and division. I can use divisibility rules to solve problems. Mental Math. Math Message.

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Divisibility

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  1. Divisibility Everyday Math Lesson 1.5

  2. Lesson Objectives • I can find the factors of a number. • I can explore relationships between the operations of multiplication and division. • I can use divisibility rules to solve problems.

  3. Mental Math

  4. Math Message Solve problems 1 and 2 at the top of Journal page 13.

  5. Homework Check • Please get out your Study Link 1.4. • With a partner at your table, compare your answers and resolve any differences.

  6. Math Message Follow-Up • How did you know the numbers you circled are divisible by 2? • ALL even numbers are divisible by 2.

  7. Vocabulary • Add the following vocabulary words to your Unit 1 vocabulary chart: • Remainder • Sum • Quotient

  8. Using a Calculator to Test for Divisibility • Find the symbol on your calculator that says Int÷ • You will use this key instead of the ÷ key to check for divisibility. • If the quotient has a remainder when dividing, that number is NOT divisible by the number you’re testing.

  9. Let’s Try It!Do the following examples in your Work Journal • Example: Is 27 divisible by 5? • On your calculator, type in 27 Int÷ 5 and then Enter. • Does the quotient have a remainder? • If it does have a remainder, then 27 is NOT divisible by 5.

  10. Example #2 • Is 27 divisible by 9? • On your calculator, type in 27 Int÷9 and then Enter. • Does the quotient have a remainder? • If it doesn’t, then 27 IS divisible by 9.

  11. Your Turn! • With your assigned partner, please complete page 13. • You will have 15 minutes to complete this page.

  12. Divisibility Rules • How can we know that a number is divisible by 2 without actually doing the division? • Can you tell whether a number is divisible by 10 without dividing? • Can you tell whether a number is divisible by 3 without dividing?

  13. Divisibility Rules (cont.) • A number is divisible by 3 if the SUM of its digits is divisible by 3. • Is 237 divisible by 3? (use your calculator) • Is 415 divisible by 3? (use your calculator)

  14. Your Turn! • With your assigned partner, please complete Journal Page 14. • When you hear the bell, please return to your seat and be ready to share your answers.

  15. Let’s Play Factor Captor • Open your SRB to page 306, read silently about how to play “Factor Captor” • With your assigned partner, you will have 15 minutes to play as many games of Factor Captor as you can.

  16. Math Boxes & Study Link • For the rest of class, work on Math Boxes 5.1 on page 15 of your Student Journal. • If you finish with Math Boxes, you may come get a Study Link 5.1 homework assignment.

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