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31 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Divisibility rule for 2 |
A number is divisible by 2 iff its ones digit is 0,2,4,6, or 8 |
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Divisibility rule for 5 |
A number is divisible by 5 iff its ones digit is 0 or 5 |
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Divisibility rule for 10 |
A number is divisible by 10 iff its ones digit is 0 |
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Divisibility rule for 4 |
A number is divisible by 4 iff the last two digits of a number rep a number divisible by 4 |
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Divisibility rule for 8 |
A number is divisible by 8 iff the last three digits of a number rep a number divisible by 8 |
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Divisibility rule for 3 |
A number is divisible by 3 iff the sum of it's digits is divisible by 3 |
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Divisibility rule for 9 |
A number is divisible by 9, iff the sum of its digits is divisible by 9 |
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Divisibility rule for 6 |
A number is divisible by 6 iff the number is divisible by 2 & 3 |
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Prime |
A counting number with exactly 2 different factors Itself & 1 |
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Composite |
A counting number with more then 2 factors. |
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Sieve of Eratosthenes |
An algorithm used to find primes You list out all of the numbers and cross out each composite number |
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Divides |
A divides B if and only if A is a factor of B |
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Divisor |
When A divides B we can also say that A is a divisor of B |
The divisor needs a visor because its outside |
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Factor |
A is a factor of B A whole number that multiplies with another number to make a third number |
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Multiple |
B is a multiple of an A multiple is a number multiplied by an integer |
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Divisible by |
B is divisible by A When dividing by a certain number it gives a whole number answer |
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Prime factorization |
You can write every composite number as a product of prime numbers |
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Factor tree |
A factor tree that shows the prime factorization of a composite number. |
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Greatest common factor |
The greatest common factor of two or more nonzero whole numbers is the largest whole number that is a factor of all of the numbers. |
The GCF of a and b is written GCF (a,b) |
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Least common multiple |
The LCM of 2 or more nonzero whole numbers is the smallest nonzero whole number that is a multiple of all of the numbers |
The LCM is written LCM (a,b) |
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Common multiple |
The smallest positive number that is a multiple of two or more numbers |
Ex; The LCM of 3 and 15 is 15 because 15 is a multiple of 3 &5 |
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Divided by |
A number that will divide the dividend exactly |
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Dividend |
The number in the division symbol |
The letters I N as in IN are in divIdeNd |
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Quotient |
The result of the division
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Remainder |
A remainder in mathematics is what is left over in the division problem |
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Common factors |
Factors are numbers we can multiply together to get another number. When we find the factors of two or more numbers and then find some factors are the same they are the common factors |
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Prime factorization |
Express the numbers 24 & 36 in their prime factor exponential form 24= 2 with the exponent of 3 |
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Set intersection GCF |
1. Find all the factors of each number 2. Find all common factors 3. Find largest number in the set of common factors |
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Prime Factorization GCF Factor tree |
1. Write both numbers in their prime exponential form 2) find common factors 3) choose numbers with smaller exponents |
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Set intersection method |
1) list the non-zero multiples of each number 2) find common multiples 3) choose the smallest number in the set of common multiples |
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Prime factorization LCM FACTOR TREES |
1. Write both numbers in prime exponential form 2. Choose # with largest exponent |
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