Reading and Writing Decimals

1. Reading and Writing Decimals Lesson 1-4

2. Place Value • The number in the chart above is read “fifty-one and three hundred forty-five thousandths.” • Read the number before the decimal. • Say “and.” for the decimal. • Read the number following the decimal. • Add the word for the place value of the last digit.

3. 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.

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

5. 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.

6. 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.

7. 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.

8. 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

9. Homework Time!