When dividing multi-digit decimals, it is acceptable to keep a decimal in the dividend (the number being divided) as well as maintaining the decimal in the divisor (the number you are dividing by). However, to simplify the calculation, it is often helpful to convert both numbers into whole numbers by eliminating the decimals.
You can do this by multiplying both the dividend and divisor by the same power of 10 (e.g., if you are dividing 4.5 by 0.9, you can multiply both by 10 to get 45 divided by 9). This allows you to perform the division more easily while preserving the overall value of the expression. After calculating, you can then assign the decimal back to the result as needed.