Basic Math & Pre-Algebra All-in-One For Dummies (+ Chapter Quizzes Online). Mark Zegarelli

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Basic Math & Pre-Algebra All-in-One For Dummies (+ Chapter Quizzes Online) - Mark  Zegarelli


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Ones Hundred Millions Ten Millions Millions Hundred Thousands Ten Thousands Thousands Hundreds Tens Ones 4 5 0 1 9 math

      In this example, notice that the presence of the digit 0 in the hundreds place means that zero hundreds are added to the number.

      Telling placeholders from leading zeros

Millions Thousands Ones
Hundred Millions Ten Millions Millions Hundred Thousands Ten Thousands Thousands Hundreds Tens Ones
5 1

      The chart tells you that 5,001,000 = 50 + 1. Clearly, this answer is wrong!

Millions Thousands Ones
Hundred Millions Ten Millions Millions Hundred Thousands Ten Thousands Thousands Hundreds Tens Ones
0 0 3 0 4 0 0 7 0

      The first two 0s in the number are leading zeros because they appear to the left of the 3. You can drop these 0s from the number, leaving you with 3,040,070. The remaining 0s are all to the right of the 3, so they’re placeholders — be sure to write them in.

      Reading long numbers

      When you write a long number, you use commas to separate groups of three numbers. For example, here’s about as long a number as you’ll ever see:

math
Quintillions Quadrillions Trillions Billions Millions Thousands Ones
234 845 021 349 230 467 304

      This version of the chart helps you read the number. Begin all the way to the left and read, “Two hundred thirty-four quintillion, eight hundred forty-five quadrillion, twenty-one trillion, three hundred forty-nine billion, two hundred thirty million, four hundred sixty-seven thousand, three hundred four.”

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