They are: 3*5*7*8 = 840, except they are factors.
All multiples of 840 are common multiples of 60 and 280
Multiples of 840
840
840
Any multiple of 42000
All multiples of their LCM is divisible by them. lcm(8, 7, 6, 5, 4, 3, 2, 1) = 840 therefore need the largest multiple of 840 which is a 3-digit number = 840 x 1 = 840.
They are: 2*4*3*5*7 = 840
840, 1680, 2520 and so on.
210, 420, 630, 840 . . .
840, 1680, 2520
No. The two closest multiples of seven are 833 and 840.
420, 840, 1260 and so on.