How do i explain to my 8yr old the following question:

which number has the same value as 28 tens?

28
280
2800
2810

Say to him if u had 10 28s which one would it be

The first one, i believe, would be correct. all the others have one thing in common, and that's that they have repeating numbers. in the second one, x and y have repeating 6's and 3's, and in the third, x and y have repeating 6's as well. in the last one, there are repeating 3's. the first one has no repeating numbers.

72 is the mode because it shows up the most number of times