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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 different positive four digit integers can be formed if the first digit must be even the last digit must be odd and all digits must be distinct?
There are 320 such numbers.
How many 5 digit numbers under 20000 are divisible by 4 and 9?
There are 278 5-digit numbers less than 20,000 that are divisible by both four and nine.
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 3 digit numbers are under 500?
The 3 digit numbers under 500 are 100 through 499.
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 3 digit positive numbers are there without 2 4 and 6?
There are 294 such 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 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.
How many three digit numbers add up to 17?
An infinite number if you can use positive and negative numbers.
