Write the following as decimals: two ones and five-tenths.

Hint: For this problem we need to write the name of the number into decimals. By following a few steps we will solve this problem. These are: We should write the number for the name from the left to the decimal point.
We will write “and” for the decimal point. We should name the “number” part to the right of the decimal point as if it were a whole number. We should name the decimal place of the last digit.

Complete step-by-step answer:
Given: - As the given number is two ones and five-tenths.
We have to write the numbers in decimals.
To find in decimals we need to follow some steps. These are:
Step 1: We should write the number for the name from the left to the decimal point.
By using step 1 in our given left of the name is five-tenths. It will be written as
$ \Rightarrow 5$
Step 2: We will write “and” for the decimal point.
By step 2 we have to write decimal point for the word “and”
$ \Rightarrow .5$
Step 3: We should name the “number” part to the right of the decimal point as if it were a whole number.
By using step 3 the right of the decimal point two ones we should write it as a whole number.
$ \Rightarrow 2$
Step 4: We should name the decimal place of the last digit.
$ \Rightarrow 2.5$

Hence, the given decimal can be written as 2.5

Note: Our decimal system of numbers lets us write numbers as large or as small as we want, using a symbol called the decimal point. In our number system, digits can be placed to the left and right of a decimal point, to indicate numbers greater than one or less than one. The decimal point helps us to keep track of where the “ones” place is. It is placed just to the right of the one’s place. As we move right from the decimal point, each number place is divided by 10.