Reading and Writing Decimals Lesson 1-2

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.

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

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.

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.

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.

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