Question

21. Find the largest 4-digit number which is exactly divisible by 6,10 and 15.​

Answer 1

Answer:

9990

Step-by-step explanation:

The biggest four digit number is 9999.

If the number is divided by 15, the number must ends with 5 or 0.

so, the biggest four digit number may be 9995.

If the number is divided by 9, it must be like this. The addition of four digit number should be divided by 9.

9+9+9+5=33. this number written by 3+3=6. 6 can't divided by 9.

the next biggest number divided by 15 is 9990.

9+9+9+0=27. 2+7=9. therefore the number 9990 is divided by 15 and 9.

If the number is divided by 6, that number must be divided by 2 and 3.

9990/2=4995

9990/3=3330

so the number 9990 is biggest four digit number divided by 6,9,15.