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Partition or decompose the number into its separate place value pieces: ones, tens, hundreds, and so on. Write it out in extended form. Example: Find the double of 453. When broken apart into separate place values: 453 = 400 + 50 + 3 Look at each partitioned portion and double it while separated. To double values larger than those in the ones place position, double the non-zero digit, then follow that calculated value with the same number of zeroes. Example: You will need to double 400, 50, and 3 separately. Since the double of 4 is 8, the double of 400 is 800. Since the double of 5 is 10, the double of 50 is 100. The double of 3 is 6. Add the doubled values together to write the answer in its standard form. Example: 800 + 100 + 6 = 906 The answer you found by adding the doubled values together should be the doubled value of your original number, and your final answer. Example: The double of 453 is 906.
Separate the number into pieces. Double each part. Add the pieces together. Write the answer.