SOLUTION: A grain of sand is placed on the first square of a chessboard, two grains on the second square, four grains on the third, eight on the fourth, and so on. Without a calculator, use
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Question 979142: A grain of sand is placed on the first square of a chessboard, two grains on the second square, four grains on the third, eight on the fourth, and so on. Without a calculator, use scientific notation to approximate the number of grains of sand required for the 64th square. (Hint: Use the fact that 2^10 ≈ 10^3.)
I got 9.2 x 10^18. The books answer was 8 x 10^18. I used the calculator for this problem. If I'm wrong, please help me. Answer by MathLover1(20850) (Show Source):
grain on the first square on the second square on the third square on the fourth square
... on the square
(exponent is always one less than the # of square to )
Answer is grains of sand on the 64th square.
Note: Do not subtract . is not the same as
