What does write the place value mean?

Answer 1

In the Hindu-Arabic numeral system (which we all use today), every digit has a place value, which is an increasing power of ten from the right. That is, units, tens, hundreds, thousands, and so on. Where a place value has no value, we write the digit zero (0) as a place-holder. Thus the placement of the digits 1024 tell us that there are four units, two tens, no hundreds and one thousands, which we read as one-thousand-and-twenty-four.