84, 168, 252, 336, 420, 504, 588, 672, 756, 840.
It is 420
504
There are infinitely many possible answers. Two examples: 1 times 84 10 times 8.4
The first four multiples of 21: 21, 42, 63, 84
84, 168, 252
The First common multiple of 6 and 7 is 42 and the next common multiple is 84.
Yes, 84 is a multiple of 7 because 7*12 = 84
28, 56 and 84
8 x 84 = 672
42, 84 & 126
Yes, 84 is the 12th multiple of 7. i.e. 7 x 12 = 84
84 is a multiple of 6 because 6*14 = 84