Write the greatest four digit number which is divisible by 9. Is it di

1.	Write the greatest four digit number which is divisible by 9. Is it divisible by 3? What do you notice?
Answer» The greatest four digit number is 9999. Sum of the digits of 9999 = 9 + 9 + 9 + 9 = 36 is divisible by 9 So, 9999 is divisible by 9. Sum of the digits of 9999 is also multiple of 3. Therefore, 9999 is also divisible by 3. We notice that the numbers which are divisible by 9 are always divisible by 3.

Write the greatest four digit number which is divisible by 9. Is it divisible by 3? What do you notice?

Answer»

The greatest four digit number is 9999.

Sum of the digits of 9999 = 9 + 9 + 9 + 9 = 36 is divisible by 9

So, 9999 is divisible by 9.

Sum of the digits of 9999 is also multiple of 3.

Therefore, 9999 is also divisible by 3.

We notice that the numbers which are divisible by 9 are always divisible by 3.