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Whats it called when second number is a factor of the first number?
The first number is divisible by the second number
You find the mean of first natural number?
The first natural number is usually taken to be 1. The mean of one number is itself so the mean of the first natural number is 1.
What is the number theory for figurng out what is divisible by 7?
First of all, it is the one that is probably not even worth doing. It is honestly easier in most cases to just try it! To determine if a number is divisible by 7, take the last digit off the number, double it and subtract the doubled number from the remaining number. If the result is evenly divisible by 7 (e.g. 14, 7, 0, -7, etc.), then the number is divisible by seven. This may need to be repeated several times.
What number is divisible by 2700?
All multiples of 2,700 which is an infinite number. The first five are: 2700, 5400, 8100, 10800, 13500.
What is the sum of the first 225 natural numbers?
Formula for sum of first natural number = n(n+1)/2 , here n=225 so, answer is 225(225+1)/2 = 25425
