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

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): You can put this solution on YOUR website!

you got it right

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

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