1
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2
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- Divisibility means that after
dividing, there will be NO remainder.
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3
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- Can you tell by just looking at this number if it is divisible by 2?
- by 5?
- by 10?
- by 3 ?
- by 9?
- By 6?
- The divisibility rules
- can help
- YOU !!!
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4
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5
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- A number is divisible by 2 if the number
- is even.
- 18 ÷
2 = 9
- 22 ÷
2 = 11
- (Notice that both of these numbers are even.)
- 21 ÷
2 = 10 R1
- (Not an even number.)
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6
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7
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- A number is divisible by 5 if it ends in 0 or 5.
- 25 ÷ 5 = 5
- 23 ÷ 5 = 4 R3
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8
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- A number is divisible by 10 if it ends in 0.
- 30 ÷ 10 = 3
- 340 ÷ 10 = 34
- 67 ÷ 10 = 6 R7
- 784 ÷ 10 =78 R4
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9
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10
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- A number is divisible by 3 if the sum of the digits is divisible by 3.
- Is the number 135 divisible by
3?
- Add the digits: 1 + 3 + 5 = 9
- Yes, 135 is divisible by 3
because the sum of the digits is divisible by 3.
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11
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- A number is divisible by 9 if the sum of its digits is divisible by 9.
- Is 369 divisible by 9?
- 369 is divisible by 9
- because
- 3 + 6 + 9 =18
- 1 + 8 = 9
- AND
- 9 is divisible by 9.
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12
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- A number is divisible by 6
- if it is divisible
- by both
- 2
and 3.
- Is 42 divisible by 6?
- Is 51 divisible by 6?
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13
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- A number is divisible by 4 if the last two digits form a number
divisible by 4
- Are these numbers divisible by 4?
- 1222
- 3421
- 6712
- 90 408
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14
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15
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- Can you tell by just looking at this number if it is divisible by 2?
- by 5?
- by 10?
- by 3 ?
- by 9?
- By 6?
- The divisibility rules
- can help
- YOU !!!
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16
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17
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18
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19
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- Divisibility is
- Un-frog-getable !!
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20
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- THE END
- Content:
- P. Frye, Oak Grove Elementary School, December 2003
Revised S. Roache, Hillcrest Academy 2008
- Graphics:
- Microsoft Clip Gallery
- AllAboutFrogs.org
- Frogland
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