How many numbers of two digit are divisible by 5?

How many three-digit numbers are divisible by 7?

How many numbers of four digit can be formed out the digits 1,2,3,4,5,6 without repitition of digits?

Using all the digits 1,4,5,8,9 in how many ways can numbers be formed,so that the numbers would be divisible by 5?

You have seen that a number 450 is divisible by 10. It is also divisible by 2 and 5 which are factors of 10. Similarly, a number 135 is divisible by 9. It is also divisible by 3 which is a factor of 9. Can you say that if a number is divisible by any number m, then it will also be divisible by each of the factors of m?

Find the sum of all the two-digit natural number which are divisible by 4.

The sum of all 2-digit numbers divisible by 5 is a)945 b)1035 c)1230 d)1245

If 4 be added with four times of the digit of the unit place of a certain number consisting of two digits, the result will be two times of the sum of the digits. But if 18 be subtracted from the number, the digit will be interchanged. Find the number.

If 2 be added to the sum of the digits of a certain number consisting of two digits, the result will be two times the number in ten's place. But if 18 be subtracted from the number, the digits will be interchanged. Find the number.

If 7 be added to the sum of the digits of a certain number consisting of two digits, the result will be three times the number in the ten's place. But if 18 be substracted from the number, the digits wil be interchanged. Find the numbers.

Find the sum of all numbers lying between 1 and 100 which are divisible by 4 or 5.