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What are all the square numbers less than 10?
They are: 1 4 and 9
How many integers less than 60 have an even number of factors?
All but the square numbers - 53 of them.
What are all of the square numbers greater than 20 but less than 50?
These numbers are: 25, 36, 49.
What number is a square number but not a prime number and is less than 100?
No square number is a prime number, since it has the number you squared as a factor. There are several square numbers less than 100. Just calculate the squares of all numbers, starting with 1, until you reach or pass 100. Then stop.
For what real numbers is the square root of x greater than x?
For all the values of x that are less than one and greater than zero.
How many numbers less than a thousand have digits less than ten?
All of them. We normally count in decimal numbers and therefore all digits in decimal numbers must be less than ten.
What are four negative numbers that are less than pi?
All negative numbers are less than pi.
What is the sum of all the prime numbers less than 201?
The sum of all the prime numbers less than 201 is 4,227.
How do you know if a number greater than 100 is a prime number?
You try dividing it by all prime numbers less than of equal to its square root.
What are all the numbers less than 100 that have odd proper factors?
There are 10 numbers less than 101 which have an odd number of factors: 1,4,9,16,25,36,49,64,81,100.
What are all the perfect numbers less than 100?
The perfect numbers less than 100 are 6 and 28.
What is special about numbers less than fifty that have less than three factors?
They all are prime numbers except 1
