Friday, March 17, 2006

Multiply by four

Bert and Ernie take turns multiplying numbers. First Bert chooses the number 4. Ernie multiplies it by 4 to get 16. Bert multiplies that by 4 to get 64. Ernie multiplies that by 4 to get 256.

After going back and forth several times, one of them comes up with the number 1,048,576. Who came up with that number, Bert or Ernie?

And no, you don't need a calculator for this one.


  1. Mr. Spreadsheet says Ernie.

  2. All of Ernie's numbers end in 6, all of Bert's end in 4. So, Ernie.

  3. That's right Tamara.

    Answer: Ernie. Notice how all of Ernie's numbers end in 6, while all of Bert's numbers end in 4.


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