Skill in adding and subtracting decimals is useful for calculating ______ .


the total children in a classroom.
the total children in a classroom.

the number of hours in two days.
the number of hours in two days.

the amount saved in buying a pair of $32.95 blue jeans on sale for $26.50.
the amount saved in buying a pair of $32.95 blue jeans on sale for $26.50.