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1.1 is to the first decimal place
The '9' is in the "first decimal" place and the '3' is in the "second decimal" place.Rules for roundingIf the number in the second decimal place is 5 or greater then the number in the first decimal place is rounded upwards by 1.If the number in the second decimal place is 4 or less then the number in the first decimal place is left unchanged.As the problem in this case is 3.93 and the number in the second decimal place is less than 5, we end up with3.9 "correct to one decimal place" or "rounded to one decimal place".
First you have to look at the first number. Then you have to look to see which decimal is closer to 1 or 0.
It is the first number to the right of the decimal.
When you divide a number by another number that isn't a factor of the first number.