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# Naming Numbers Help

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## Naming Numbers

Our number system is called the Hindu-Arabic system or decimal system. It consists of 10 symbols or digits , 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9, which are used to make our numbers. Each digit in a number has a place value . The place value names are shown in Fig. 1-1 .

Fig. 1-1.

In larger numbers, each group of three numbers (called a period ) is separated by a comma. The names at the top of the columns in Fig. 1-1 are called period names.

To name a number, start at the left and going to the right, read each group of three numbers separately using the period name at the comma. The word "ones" is not used when naming numbers .

Name 83,261,403.

#### Solution 1

Eighty-three million, two hundred sixty-one thousand, four hundred three.

Name 308,657.

#### Solution 2

Three hundred eight thousand, six hundred fifty-seven.

#### Example 3

Name 413,000,000,025.

#### Solution 3

Four hundred thirteen billion, twenty-five.

Math Note: Other period names after trillions in increasing order are quadrillion, quintillion, sextillion, septillion, octillion, nonillion, and decillion.

### Naming Numbers Practice Problems

#### Practice

Name each number:

1. 632

2. 8,506

3. 413,857

4. 33,605,493,600

1. Six hundred thirty-two

2. Eight thousand, five hundred six

3. Four hundred thirteen thousand, eight hundred fifty-seven

4. Thirty-three billion, six hundred five million, four hundred ninety-three thousand, six hundred

More practice problems for these concepts can be found at: Whole Numbers Practice Test.

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