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Assuming it takes about 1 second to count each dollar, it would take one billion seconds, or about 31 years and 8 months.
Rather than count each square individually, count the squares (8) along the top of a chess board, and count the squares (8) down the side. 8 x 8 = 64 squares in total. (You could, if you wish, also include the whole board as a square = 65.)
One times eight = 8 8 times 1 also means 1 lots of 8. It means that you count 8 once, so the number stays as 8. This goes for all numbers timed by 1. 8 = eight 1 = one 8 x 1 = 8 eight x one = eight
Sum = 36 Count = 6 Average = Sum/Count = 36/6 = 6
One way is to count by 2's five times: 2, 4, 6, 8, 10The other way is to count by 5's two times: 5, 10