Saturday, February 14, 2009
Thursday, February 5, 2009
Math Trick
Phone Number Trick
1. Get a calculator. (You won't be able to do this one in your head)
2. Key in the first three digits of your phone number (NOT the area code)
3. Multiply by 80
4. Add 1
5. Multiply by 250
6. Add the last 4 digits of your phone number
7. Add the last 4 digits of your phone number again.
8. Subtract 250
9. Divide number by 2
Do you recognize the answer?
1. Get a calculator. (You won't be able to do this one in your head)
2. Key in the first three digits of your phone number (NOT the area code)
3. Multiply by 80
4. Add 1
5. Multiply by 250
6. Add the last 4 digits of your phone number
7. Add the last 4 digits of your phone number again.
8. Subtract 250
9. Divide number by 2
Do you recognize the answer?
Sunday, February 1, 2009
How big is a trillion?
One trillion is the number "1" followed by 12 zeroes, as in: 1,000,000,000,000.
One trillion seconds of ordinary clock time = 31,546 years.
So, spending at $1 a second, it would take 31,546 years to spend $1 trillion.
If someone were to build city blocks that contained 10 homes valued at $100,000 per home, you would end up with 10 houses to a block, 10 blocks to a mile and a hundred blocks per square mile. It would take 10,000 square miles to reach $1 trillion in value. This would be than larger than six U.S. states: Vermont, 9,615 square miles; New Hampshire, 9,351 square miles; New Jersey, 8,722 square miles; Connecticut, 5,544 square miles; Delaware, 1,954 square miles; and Rhode Island, 1,545 square miles.
One trillion seconds of ordinary clock time = 31,546 years.
So, spending at $1 a second, it would take 31,546 years to spend $1 trillion.
If someone were to build city blocks that contained 10 homes valued at $100,000 per home, you would end up with 10 houses to a block, 10 blocks to a mile and a hundred blocks per square mile. It would take 10,000 square miles to reach $1 trillion in value. This would be than larger than six U.S. states: Vermont, 9,615 square miles; New Hampshire, 9,351 square miles; New Jersey, 8,722 square miles; Connecticut, 5,544 square miles; Delaware, 1,954 square miles; and Rhode Island, 1,545 square miles.
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