Lee Shi Heng

the smallest 10-fender is not 630. it is 540. i chose 1,4,5,27 and multiplied all of them together. The 1 for the 1 fender The 4 for the 2 and 4 fender (even numbers are divisible by 2) The 5 for the 5 and 0 fender (even numbers multiplied by 5 results in a multiple of 10) The 27 for the 3, 6, 7, 8 and 9 fender 27 multiplied by an even number would result it being divisible by 6 and 18. The factors of 6 is 3 and 2, the factors of 18 is 3, 3, 2.