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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

Divisibility

Everyday Math Lesson 1.5

lesson objectives
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.
math message
Math Message

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

homework check
Homework Check
  • Please get out your Study Link 1.4.
  • With a partner at your table, compare your answers and resolve any differences.
math message follow up
Math Message Follow-Up
  • How did you know the numbers you circled are divisible by 2?
    • ALL even numbers are divisible by 2.
vocabulary
Vocabulary
  • Add the following vocabulary words to your Unit 1 vocabulary chart:
    • Remainder
    • Sum
    • Quotient
using a calculator to test for divisibility
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.
let s try it do the following examples in your work journal
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.
example 2
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.
your turn
Your Turn!
  • With your assigned partner, please complete page 13.
  • You will have 15 minutes to complete this page.
divisibility rules
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?
divisibility rules cont
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)
your turn1
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.
let s play factor captor
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.
math boxes study link
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.