40.21
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There is no "one" in decimal place value. The first decimal place is known as tenths.Thus, 2.4 is equal to two and four tenths.
The correct answer is 0.000022
The column two to the right of the decimal point is the hundredths column.Multiply any digit in this column by one hundredth to get its place value (in the number).
two ten thousandths.
The number is given to only one decimal place so you cannot round it to two places. The number could have had any value in the range [0.55 to 0.65] and you have no way of knowing what it was so no way of representing the number to two decimal places.