Yes. 0, 7, 14, 21, 28
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No, it is not. The result of 834/7 is 119.14285no. 834/7=119.1428571... it does not come out as a whole number so it is not a multiple of 7.
The lowest common multiple of 7 and 9 is greater than 40.
7 & 9 only have one factor in common: 1. So the number which is a multiple of both is 7 x 9 = 63.
Zero is the identity under addition.