Example 617 divided by 6. If you estimate that 600 divided by 6 is 100, you know that the actual answer will have a 1 in the hundreds place.
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4 x 1 = 4 (4 / 1 = 4) 4 x 10 = 40 (40 / 4 = 10) Since 18.88 is between 4 and 40, you can conclude that the quotient must be between 1 and 10.
The tenths place in decimals is the first digit to the right of the decimal point. For example, 15.2 is fifteen and two tenths.
The first-place finisher can be any one of the 9 skiers. For each of these choices, the second-place finisher can be any one of the remaining 8 skiers. For each of these choices, the third-place finisher can be any one of the remaining 7 skiers. So there are (9 x 8 x 7) = 504 ways in which the first, second, and third places can be comprised of members of the group of nine skiers.
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