Divisibility

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# Divisibility - PowerPoint PPT Presentation

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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## PowerPoint Slideshow about 'Divisibility' - tosca

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Presentation Transcript

### 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.
Math Message

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

Homework Check
Math Message Follow-Up
• How did you know the numbers you circled are divisible by 2?
• ALL even numbers are divisible by 2.
Vocabulary
• Add the following vocabulary words to your Unit 1 vocabulary chart:
• Remainder
• Sum
• Quotient
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.
• 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
• 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.
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.)
• 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)