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# Math help from the Learning Centre

This guide provides useful resources for a wide variety of math topics. It is targeted at students enrolled in a math course or any other Centennial course that requires math knowledge and skills.

## Place Value

The decimal number system is a base 10 system, so the digits of each place can be any number from 0 to 9. Each place value has a name. For large numbers, digits are separated by commas or spaces into groups of three, called periods. For example,

$12,340,982\qquad 320\,432\,196$

Examples:

1. Name the following number: $$384,341$$

Solution:

Three hundred eighty-four thousand, three hundred forty-one.

2. Write out the following number: Twelve million, thirty-eight thousand, two

Solution:

$$12,038,002$$

Note there is no and separating periods. The word and is reserved for decimal place values after the ones column.

3. What place value is underlined for the following numbers:

a. $$820,3\underline{3}0,020$$ - ten thousands

b. $$\underline{4}032$$ - thousands

c. $$1,402,\underline{4}97$$ - hundreds