How many 2 digits numbers are there in which the ones digit is greater than the tens digit?

How many 2 digits numbers are there in which the ones digit is greater than the tens digit?

Here are the numbers that satisfy the conditions. 90, 91, 92, 93, 94, 95, 96, 97, 98, Hence the total is 1+2+3+4+5+6+7+8+9=45 numbers.

Why is nine a prime number?

The number 9 is divisible by 1, 3, 9. For a number to be classified as a prime number, it should have exactly two factors. Since 9 has more than two factors, i.e. 1, 3, 9, it is not a prime number.

How many 2 digit prime numbers are there between 10 and 99?

Those are : 11,13,17,31,37,71,73,79 & 97.

Which is the largest 2 digit prime number?

97
97 is: the 25th prime number (the largest two-digit prime number in base 10), following 89 and preceding 101. a Proth prime as it is 3 × 25 + 1.

Is 9 divisible by?

A number is divisible by 9, if the sum is a multiple of 9 or if the sum of its digits is divisible by 9. Consider the following numbers which are divisible by 9, using the test of divisibility by 9: 99, 198, 171, 9990, 3411. Sum of the digits of 99 = 9 + 9 = 18, which is divisible by 9.

What is the number where the tens digit is half the ones?

The only one where the tens digit is half of the ones digit is 36. The Rock reveals the best success hack everybody needs to try. The big companies don’t want you to know his secrets. let the two digits be x and y with x in tens digit. Now you have x+y=9 and y=2x. Now solve it and you will get the answer.

What is the name of the number with two digits?

For a two-digit number, the first digit occupies the Tens place and the second digit occupies the Ones place. The name of the number is Thirty-two.

What is the difference between at ten’s place and at one’s place?

At one’s place, the digit which is at the extreme right is known to be like one’s, whereas the digit placed at the leftmost is known to be at ten’s. For example, consider a two-digit number say 39. The number 39 in expanded form can be written as 39 = 30 + 9 = 3 × 10 + 9. ⇒ 3 is at ten’s place, and 9 is at the unit’s place.

What are the two-digit prime numbers between 90 and 99?

Even numbers can’t be prime and other odd numbers between 90 and 99 has factors. 91 has 13 and 7, 93 has 31 and 3, 95 has 19 and 5 and 99 has 9 and 11 19,29,59,79,89 are all two-digit prime numbers with 9 at the tenth place.