SKY HIGH
From Reader's Digest

If it cost one cent to ride 1,000 miles, a trip around the world would cost 25 cents. A trip to the moon would cost $2.40, and a trip to the sun would cost would cost $930. How much do you think it would cost to travel to Alpha Centauri, the nearest star to Earth other than our sun?

Answer:

$260,000,000

Explanation of the math:

Think of the distances as multiplied by 1,000 - to give the number of cents. Then translate the number of cents into dollars by dividing by 100 (if necessary).

Earth - circumference of 25,000 miles - 25 thousands = 25 cents 

Moon - 240,000 miles from Earth - 240 thousands = 240 cents = $2.40

Sun - 93,000,000 miles from Earth - 93,000 thousands  = 93,000 cents = $930

Alpha Centauri - 26,000,000,000,000 miles from Earth
                              26,000,000,000 thousands
                              26,000,000,000 cents = $260,000,000

Note: Alpha Centauri's distance at 26 trillion miles can also be expressed as 4.2 light years.