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Look at the number in standard form. Separate the digits. Identify each place value name. Multiply the left digits by the appropriate value. Divide the right digits by the appropriate value. Write your final answer.
Read the number and count how many digits are in it, paying special attention to the digits that come after (to the right of) the decimal point.   Example: Write 531.94 in expanded form. Read the number: five hundred thirty one and 94 hundredths. Notice that there are three digits before the decimal point and two digits after the decimal point. There will be a total of five separate places in the expanded form of this number. Rewrite the number, separating each individual digit by a plus sign. For now, write the decimal point, too.  Note that the decimal point will eventually be removed, but you should keep it in place for now to prevent confusion while solving the problem. Leave some space in between the digits and the plus signs. More information will need to be written there.  Example: The number 531.94 temporarily becomes: 5 + 3 + 1 + . + 9 + 4 Label each digit with the place value name that matches its position in the original number.  When working before (to the left of) the decimal point, work from the lowest number to the highest. When working after (to the right of) the decimal point, work from the highest number to the lowest.  Example: You will need to count three places to the left and two places to the right.  For the left values: The smallest number is 1, which matches the ones (1) place. The second number is 3, which matches the tens (10) place. The largest number is 5, which sits in the hundreds (100) place. For the right values: The largest number is 9, which sits in the tenths (10) place. The smallest number is 4, which sits in the hundredths (100) place. All of the digits on the left side of the decimal point must be multiplied by their matching place value. Do that now.  Example: [5 * 100] + [3 * 10] + [1 * 1] = 500 + 30 + 1 All of the digits on the right side of the decimal point must be divided by their matching place value. Do that now.  Example: [9 / 10] + [4 / 100] = 0.9 + 0.04 Combine all of your rewritten values together, placing plus signs in between each one. Remove the decimal point. This will be your final answer.  Example: The expanded form of 531.94 is: 500 + 30 + 1 + 0.9 + 0.04