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When two of more number are multiplied each number is called a(n) what of the prouduct?
They are called the factors.
What letter must appear at the beginning of the registration number of all non-military aircraft in the U.S.?
N
Can you find a five-digit number which when you place a 7 at the beginning to make a new number is 4 times larger than when you place the 7 at the end?
Use the idea of place-value, and write the corresponding equation. With the 7 at the beginning, your number is 7xxxxx, so the 7 is worth 700,000; with the seven at the end, it is only worth 7. So, if you call your number "n", your equation would be something like700000 + n = 4(n + 7) Solve this, and you get "n" as a 5-digit number.
When you find the number that when multiplied by the given number they will equal 1?
The number you are looking for is called the reciprocal (or multiplicative inverse). All that sound very complicated, but the reciprocal of a number n is simply 1/n.
What is a number n where if the sum of the digits of the number is divisible by n, then the number itself is divisible by n?
(The assumes that "the number" in the question is not n, although if they are they same number, this is still true.) "If the sum of the digits of the number is divisible by n, then the number itself is divisible by n" is true if n is 3 or if n is 9.
