3,242,509,523 is divisible by which integers 1-10?
Not 2: must be even Not 3: digits must add up to a multiple of 3 Not 4: Last two digits must add up to a multiple of 4 Not 5: number must end in a 5 or 0 Not 6: must meet 2 and 3 requirements Guess for 7 Not 8: must meet 2 and 4 for it to be possible Not 9: digits must add up to a multiple of 9
If ab = c is a the factor or multiple of c?
factor 2 is a factor of 10 10 is a multiple of 2
What numbers have an odd number of factors?
Positive perfect squares (everything else has an even number of factors)
What is a prime number?
An integer that only has two factors, 1 and itself note: 0, 1 are not prime numbers another note: there is no distinguishable pattern of prime numbers
What does Greatest Common Factor mean?
The largest divisor of 2 or more integers
What does the Least Common Multiple mean?
The Least Common Multiple is the smallest integer that is divisible by 2 or more numbers
What is a rational number?
Any number that can be expressed in the form of a/b where a & b are both integers.
What is a "perfect square?"
An integer raised to the power of 2
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