Add them together and divide by two.
There is no quick way to work out if a number is prime or not, the only way is to see if it can be divided by any numbers that aren't itself or one.
No number is "between" a single number. In this case, it is the other way round: the square root is between two whole numbers.
18.8 (By the way, the number halfway between is also the "average" of the two numbers.)
18.8 (By the way, the number halfway between is also the "average" of the two numbers.)
By finding two same numbers that when multiplied together equals the given whole number
A prime number is one that is only divisible by 1 and itself. Just work out if it divides into anything. To do this try dividing the number by all prime numbers under its half way value.
To get the number one-half of the way between you add the numbers together and divide by 2, leaving you with 5.35
The set of rea numbers is infinitely dense. What this means is that there are infinitely many numbers between any two numbers - however close together they might be. For example, between 1 and 2, there are:1.000000000001 1.000000000002 1.0000000000021 1.0000000000022 and so on.
Is 5.35
One way to get a number between two numbers - specifically, the number that is exactly in the middle between both - is to take the average of the two numbers. Just add the two numbers, and divide the result by 2.
There are an infinity of numbers between 1 and 100 by way of fractions or decimals. The normal answer is 100. Between includes the first and last number.
There are no integers (or whole numbers) between two and three. The fraction exactly half way between is 2.5. There are also an infinite number of other decimal numbers spread throughout.