How would you go about this math problem?

In a small city, there are 3 different exchanges possible for a 7 digit telephone number. The exchange is the first 3 digits of the telephone number. Each of the last 4 digits can be any integer from 0-9. How many telephone numbers are possible in the town?

Thanks! A step by step instructions would be nice, and even the answer too, but only give the answer with instructions of how to find the answer.

there are 3 different exchanges, so keep that in mind for now.

each last digit can a number from 0 to 9.
That's 10 different possibilities for each number.
Since there are 4 digits with 10 different possbilities each, the number of total possibilities is 10^4.
since there are 3 different exchanges, multiply by 3:
3 * 10^4 = 30000 possibile numbers.

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