We will solve addition and subtraction operations of decimal numbers in vertical form, always keeping in mind the following rules:

• All the rules that are applicable to the addition and subtraction of whole numbers also apply to decimal numbers.

• The decimal points must always be aligned one under the other.

• Numbers must be written in an orderly manner - both to the right of the decimal point and to its left (tenths under tenths, hundredths under hundredths, and so on)