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How many positive two digit numbers are there?
90
How many positive four digit numbers have 7 as their second digit and 8 as their last digit?
90
How many three digit positive numbers are divisible by 6?
149 of them.
How many 4-digit positive even numbers are there?
4,000 even numbers, 4,000 odd numbers.
How many positive no.s with 2 digits?
All the numbers from 10 to 99 are positive 2 digit integers
How many 3 digit positive integers are there?
900 numbers from 100 to 999
How many 2 digit numbers have a difference of 90?
There are no pairs of 2-digit numbers with a difference of 90 if both numbers are positive or both negative. However, with one positive and one negative, there are 71 pairs.
How many 3 digit numbers can be formed from 5 numbers without repeating?
6
How many 3 digit positive numbers under 900?
899 - 99 = 800 of them
How many 4 digit numbers can you make without repeating?
5040
How many three digit positive integers are square numbers?
102 = 100 which is the first possible three digit number that is a perfect square. 312 = 961 which is the last possible three digit number that is a perfect square. So there are 22 three digit positive numbers that are perfect squares.
How many positive prime numbers have a ones digit of 5?
Only one positive prime number has a 5 in the ones digit. That prime number is 5. All other numbers with a 5 in the ones digit are composite because they will be divisible by 5.
