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Test Prep > Number Properties > Flashcards

Number Properties Flashcards

1
Q

AbsVal(n)

A

The distance n is from 0 on the number line

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2
Q

Prime number definition

A

A number is prime if it’s only factors are one and itself

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3
Q

What is the only even prime number

A

2

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4
Q

What is the smallest prime number

A

2

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5
Q

The 15 prime numbers less than 50

A

2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47

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6
Q

10 prime numbers between 50 and 100

A

53, 59, 61, 67, 71, 73, 79, 83, 89, 97

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7
Q

How to find the total number of factors of a number

A

Step 1: prime factorize the number
Step 2: add 1 to each exponent from the base numbers in the prime factorization and then multiply the resulting sums together

12: 2^23 -> (2+1)(1+1) -> 6 factors

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8
Q

Prime factorization of n is xy^2z..
How many unique prime factors

A

3

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9
Q

Prime factorization of n is xy^2z..
How many total prime factors

A

4

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10
Q

How many prime factors does 1 have?

A

0, since it can’t be expressed as the product of one or more prime numbers

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11
Q

Lcm

A

Smallest number into which a set of numbers will divide, or smallest multiple of all numbers in set

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12
Q

Gcf

A

Largest number that divide evenly into all numbers in a set

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13
Q

How do you find gcf?

A

Step 1: prime factorize
Step 2: Identify repeated prime factors among the numbers
Step 3: of any repeated prime factors among the #s take only those with the smallest exponent (if no repeated prime factors, gcf is 1)
Step 4: take product of numbers in step 3

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14
Q

Gcf will always be (bigger/smaller) than the largest number in the set?

A

Smaller

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15
Q

Lcm will always be (bigger/smaller) than the largest number in the set?

A

Bigger (or equal to)

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16
Q

What does the product of:
LCM(x,y)*GCF(x,y) = ?

A

x*y

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17
Q

y divides evenly into x translates to…?

A

x/y

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18
Q

X is divisible by y translates to..?

A

x/y

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19
Q

x is a dividend of y is synonymous with..?

A

x is divisible by y

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20
Q

If x is divisible by y, then x is also divisible by some, all, or no factors of y?

A

All factors of y

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21
Q

If z is divisible by both x, and y, then z is also divisible by..?

A

LCM of x,y

Z is divisible by 3,4, then z is also divisible by 12

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22
Q

Divisibility rule for 3

A

If sum of all digits is div by 3

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23
Q

Divisibility rule for 4

A

If last two digit of number are div by 4

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24
Q

Divisibility rule for 5

A

If units digit is 0, or 5

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25
Q

Divisibility rule for 6

A

If number is even and digits sum to a multiple of 3

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26
Q

Divisibility rule for 8

A

If number is even and last 3 digits are divisible by 8

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27
Q

Is a number ending in 000 divisible by 8?

A

Yes, all multiples of 1000 are divisible by 8 since 1000 = 125*8

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28
Q

Divisibility rule for 10

A

If units digit is 0

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29
Q

Divisibility rule for 11

A

If sum of odd numbered digits - sum of even numbered digits is divisible by 11

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30
Q

Divisibility rule for 12

A

If number is divisible by both 3, and 4 it is divisible by 12

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31
Q

the product of n consecutive integers is divisibly by..?

A

n!

32
Q

Its division results in a decimal remainder, such as 9.48, is it possible to determine the remainder?

A

No, there are infinite possibilities. You can only go from fraction to decimal remainder, not the other way. Best you can do is convert decimal into reduced fraction, then you would know that the actual remainder is some multiple of that. Ex: 9.48 -> 9(12/25), so remainder is a multiple of 12.

33
Q

Product of n consecutive even integers is always divisible by ?

A

(2^n) x n!

34
Q

For a divisor n, what is the range of possible remainders?

A

0 through (n-1)

35
Q

How do you determine the number of trailing zeros in a number

A

= # of (2,5) pairs in the prime factorization of that number

36
Q

trailing zeros are created by powers of (what number)

A

10

37
Q

520 has one trailing zero and thus has _ power of 10?

5200 has two trailing zeros and thus has _ power of 10?

A

1 (ie 10 = 10^1)
2 (ie 100 = 10^2)

38
Q

for any n>=?, n! will have units digit of zero

A

5, since that product contains a (2,5) pair that yeilds a trailing zero

39
Q

1/x (where x is a k digit integer that is not a perfect power of 10) has how many leading zeros

A

k-1

40
Q

1! = ?

A

1

41
Q

0! = ?

A

1

42
Q

The prime factorization of a perfect square will contain only (odd/even) exponents?

A

even

42
Q

a number squared is a …?

A

perfect square

42
Q

prime factorization of a perfecgt cube will only have prime factors with exponenents that are divisible by ?

A

3

43
Q

What property of a fraction causes a terminating decimal

A

if the denominator of the fraction (in its most reduced form) contains only 2’s, 5’s, or both

44
Q

Do all divisors exhibit remainder patterns?

A

Yes

45
Q

When we divide consecutive positive integers by integer n, the remainder pattern will be

A

0, 1, 2, .. , n-1

46
Q

when a whole number is divided by 10 what will the remainder be?

A

the units digit of the dividend. So, 153/10 -> remainder is 3

47
Q

when a whole number is divided by 10^n, what will the remainder be?

A

the last n digits of the dividend. So 153/1000 = 153/(10^3) -> remainder is 153

48
Q

What special pattern arises (re remainders) when integers with the same units digit are divided by 5

A

the remainder is constant (ex: 9/5 has remainder 4, 19/5 has remainder 4, …)

49
Q

Two consecutive integers (will/will not) share (some/any) of the same prime factors?

A

they will not share any of the same prime factors

50
Q

What is the GCF of two consecutive integers?

A

GCF(n, n+1) = 1

51
Q

what is the term for the greatest integer that will divide into a set of numbers?

A

Greatest common factor

52
Q

radical(positive number) will (always/sometimes) be positive?

A

always

53
Q

what is a whole number?

A

all positive integers, plus zero (all non-negative integers)

54
Q

2n represents (even or odd #s) and 2n+1 or 2n-1 represent (even or odd #s)

A

2n -> even
2n+1 or 2n-1 -> odd

55
Q

even+/-even = ?

A

even

56
Q

odd+/-even = ?

A

odd

57
Q

odd+/-odd=?

A

even

58
Q

even x [anything] = ?

A

even

59
Q

odd x odd = ?

A

odd

60
Q

even/even =?

A

could be odd or even

61
Q

even/odd = ?

A

even

62
Q

odd/odd = ?

A

odd

63
Q

why is there no rule for odd/even =?

A

because an odd number divided by an even number will never be an integer

64
Q

the word factor is synonymous with what?

A

divisor

65
Q

if a set of numbers share no prime factors, what is the LCM of that set of numbers?

A

the product of the numbers in the set

66
Q

if there are no repeated prime factors between a set of numbers, what is the GCF of the set?

A

1

67
Q

if we know that x/y=int (y divides evenly into x), then the LCM and GCF of the set x and y are?

A

LCM = x, GCF = y

68
Q

does the LCM of a set of numbers provide us with all the unique prime factors of the set? if so, what else does it provide us?

A

yes, and the unique prime factors of the product of the numbers in the set

69
Q

in a fraction, which of the numerator and denominator is the dividend and which is the divisor?

A

numerator is the dividend, and denominator is the divisor

70
Q

what is the units digit of 999^500?

A

1, since it is a number ending with a units of 9 raised to an even power (just memorize this)

71
Q

what is the units digit of 999^499

A

9, since it is a number ending with a units of 9 raised to an odd power (just memorize this)

72
Q

if we know that positive integer y divides evenly into positive integer x (ie. x/y = int, or x is a multiple of y), then what do we know about the GCF and the LCM of those two numbers?

A

GCF(x,y) =y, and LCM(x,y)=x

73
Q

if positive integer N divided by positive integer d leaves remainder r, then the possible values of N are: r, r+d, r+2d, r+3d,….

A

if positive integer N divided by positive integer j leaves a remainder b, and if N divided by positive integer k leaves a remainder of c, then all possible values of N can be found via the following process:

Step 1: find the smallest possible value of N
Step 2: add the LCM of J and K to this smallest value as many times as necessary

Test Prep (43 decks)

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