We want to find the value of the 8 in 281,480,100
Let's find the place value of each of the numbers:
2 - hundred millions
8 - ten millions
1 - millions
4 - hundred thousands
8 - ten thousands
0 - thousands
1 - hundreds
0 - tens
0 - ones
I see there are two 8's so I wouldn't be too sure of which value to find, but just in case, we have the chart made above for place values.
There is one 8 at the ten millions value.
There is one 8 at the ten thousands value.
So, you had done everything right so far (other than squaring the 2), but that was only half of the question.
to find the least common multiple, you need to first figure out what the prime factors have in common.

each have two twos. both have one 5, so we know our answer will look something like

now to figure out the other stuff... we have to represent the greatest amount of everything that is left, and we have 3s and 7s left over, so we need to figure out how many of each we need.
one has one 3 and one has two, so we need two threes. now our equation is

what's the only number we have to deal with? 7...
how many sevens does 60 have? 0, and 630 has 1, so we know we need one 7. our answer becomes
19-(-39)
19+39=58
is solution as
the two end points are 19 and -39 we should subtract then we get the distance between