They are: 3*5*7*8 = 840, except they are factors.
Multiples of 840
All multiples of 840 are common multiples of 60 and 280
840
840
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.
Any multiple of 42000
They are: 2*4*3*5*7 = 840
840, 1680, 2520 and so on.
210, 420, 630, 840 . . .
To determine how many times 4 goes into 840, you divide 840 by 4. Performing the calculation, 840 ÷ 4 = 210. Therefore, 4 goes into 840 a total of 210 times.
280, 560, 840
840, 1680, 2520