Question

Determine the greatest 5-digit number which is exactly divisible by each of 8, 15 and 21.

Answer 1

Answer: 999609

Step-by-step explanation:

By investigating the prime factorizations of 8 (2x2x2), 15 (3x5), and 21 (3x7), you can determine that their Least Common Multiple is 2x2x2x3x5x7 which is 840. The greatest 5 digit number is 99999

Answer 2

Step-by-step explanation:

The greatest 5 digit no. is 99999

lcm of 8,5,21 is =840

dividing 99999 by840 remainder is=r

find r value

then subtract r from 99999

and the resultant 99999- r is ur answer