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13 Cards in this Set
- Front
- Back
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Divisibility Rule for 3
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If the sum of the integers digits is a multiple of 3
147 = 1 + 4 + 7 = 12, so 147 is divisible by 3 |
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Divisibility Rule for 9
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If the sum of the integers is a multiple of 9
144 = 1 + 4 + 4 = 9, so 144 is divisible by 9 |
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Prime Numbers Less Than 20
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1, 2, 3, 5, 7, 11, 13, 17, 19
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Prime Numbers Between 20 and 50
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23, 29, 31, 37, 41, 43, 47
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All Primes From 0 - 50
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1, 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47
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If x is divisible by 6 then...
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x is a multiple of 6
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Will 15 divide 4,725?
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Yes Location 1862
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What are the two largest odd factors of 90?
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15 and 45 Location 1875
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If x is divisible by 33, what other numbers is x divisible by?
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1, 3, 11, 33
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The prime factorization of a number is 3 x 3 x 7. What is the number and what are all its factors?
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No. 63; Factors: 1, 3, 7, 9, 21, 63 Location 1984
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If 7x is a multiple of 210, must x be a multiple of 12?
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No. Location 2001
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If Q is divisible by 2, 6, 9, 12, 15, and 30, is Q divisible by 8?
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Maybe. Location 2014
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If N is the product of 2, 3, and a two-digit prime number, how many of its factors are greater than 6?
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4. Location 2054
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