Reading and Writing Decimals

1. Reading and Writing Decimals

2. Reading Decimals • Read the number before the decimal point. • Say “and” when you get to the decimal. • Read the number after the decimal. • Say the name of the place that the decimal ends in.

3. Example 8,243.67 Eight thousand, two hundred forty-three and sixty-seven hundredths

4. Expanded Form • Write the number that appears before the decimal point in expanded form. • For decimals, place a zero in the ones place. • Also, substitute zeroes for all spaces after the decimal point that come before the digit that you are working with.

5. Example: Write 13.361 in expanded form. Remember, deal with the number before the decimal first. + 0.3 + 0.06 + 0.001 10 + 3 Then, do the decimal part.

6. From Words to Standard Form • Read everything that comes before the word “and.” Write that number down. • Place a decimal point at the word “and.” • Read the last word of the sentence to see how many decimal places you need. • Fill in the decimal places with your number. Fill in as far to the right as possible, and use zeroes to fill any empty spaces.

7. Example: Write the following number in standard form:two hundred six and fifty-four ten-thousandths 5 4 206 . __ __ __ __ 0 0 The word “ten-thousandths” indicates that we need four decimal places. When we clean it up, the answer is 206.0054

8. Example: Write the following number in standard form:Twelve and sixteen thousandths __ __ __ 0 1 6 12 . The word “thousandths” indicates that we need three decimal places. Place the 6 and the 1 in the last two decimal places. Then fill in any remaining decimal places with zeros.

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