A digit less than 6 would be 4 or 5. The sums for 10 would be 9+1, 8+2, 7+3, 6+4 and 5+5. Only numbers from 450-549 can be rounded to 500. All the possibilities would be 455,464,473,482,491,519,528,537 and 548. That is 9 possible numbers.
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18.You can answer it easily by considering three places for three digits of the number.The hundreds place cannot take zero hence it can take 2 values.The next two places can take all the three digits.Hence the total number of ways is 2*3*3=18.
The number of digits on both sides of the decimal point is up to you! For instance, Pi is accepted as being 3.14 (two places) for general use. But, 3.14159265359 is to 11 places, and it can stretch on into infinity!
The digits should stay where they are. The decimal point should move 2 places to the left.
Since both multiplicands are integers, then so is their product.
Three. This refers to the number of significant digits AFTER the decimal point.