The value of a digit depends on its place in a number. This is its place value.
place value chart
looking at the place value chart  you can
see that there is a 3 in the hundred place
which means 100 three times=300, 6 in
the tens place means 10 six times=60 and
9 in the ones place means one nine
times=9.      Total=
369
369 = 300 + 60 + 9.
.
Understanding place values
Place Value Chart
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This number could be written in three forms, standard form,
expanded form, or word form.
Example:   Standard form - 367     Expanded form - 300 + 60 + 9           
Word -  form
three hundred sixty-nine
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