1-5 Divisibility 9/14/09

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# 1-5 Divisibility 9/14/09 - PowerPoint PPT Presentation

1-5 Divisibility 9/14/09. Objective: use divisibility rules to solve division problems. Vocabulary. Dividend Number being divided Divisor Number dividing up the dividend Doing the dividing up Quotient The result of a division problem Divisible If the remainder is zero.

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### 1-5 Divisibility 9/14/09

Objective: use divisibility rules to solve division problems

Vocabulary
• Dividend
• Number being divided
• Divisor
• Number dividing up the dividend
• Doing the dividing up
• Quotient
• The result of a division problem
• Divisible
• If the remainder is zero
Divisible by 5
• Multiple of 5
• Ends in 0 or 5
• Name three numbers that are divisible by 5 (at least three digits)
Divisible by 10

Ends in 0

Name three numbers that are divisible by 5 and 10 (at least three digits)

Divisible by 2
• Is the number even?
• Meaning the number ends in 0, 2, 4, 6, 8
• Which of the following numbers are divisible by 2?
• 2,001
• 422
• 97,734
Divisible by 3
• The sum of the digits is divisible by 3
• Add up all of the digits: 312
• 3 + 1 + 2 = 6
• Ask yourself if 3 goes into that number evenly
• If the answer is yes, it is divisible by 3
• 6 / 3 = 2
• 312 is divisible by 3
• Which of the following numbers are divisible by 3?
• 456
• 133
Divisible by 6
• If the number is divisible by 2 and 3
• Check if the number is even
• Check if the sum of the digits is divisible by 3
• If the answer is yes to both questions, the number is divisible by 6
• 942
• Ends in 2, so it is even (divisible by 2)
• 9 + 4 + 2 = 15 15/3 = 5 (divisible by 3)
• Divisible by 6 because it passes the divisibility test for 2 and 3
• Is 1,234 divisible by 6? Prove it!
• Ends in 4, so it is divisible by 2
• 1 + 2 + 3 + 4 = 10 (10 is not divisible by 3)
Divisible by 9
• The sum of the digits is divisible by 9
• What rule is this similar to?
• Name three numbers that are divisible by 9 (each number must be at least three digits)
Divisible by 4
• The last two digits are divisible by 4
• 12,344
• 44/4 = 11
• 99,824
• 24/4 = 6
• Name two four-digit numbers that are divisible by 4
Let’s Test the Divisibility
• Are these numbers divisible by 2, 3, 6, 9? Prove it!
• 144
• 647
• 2,294
Today’s Activities
• Finish Factor Practice sheet
• Journal p. 10 and 14
• Check in
• Play Factor Captor
• Boards on side counter
• Use SRB to follow directions