7.1 Adding and subtracting decimal numbers

Adding and subtracting decimal numbers

In this section, we will add and subtract decimal numbers. The process of adding and subtracting decimal numbers is the same as adding and subtracting whole numbers. For example, both involve regrouping. After lining up the decimals, you will sometimes have to add one or more zeroes to a number after the decimal point. Being able to add and subtract decimal numbers is an important life skill, especially when dealing with money and purchases.

Lessons

  • 1.
    Evaluate. Then, round your answer to the nearest tenth.
  • 2.
    The table shows the approximate lengths of some dinosaurs.

    Dinosaur

    Height

    Dryosaurus

    6.52ft

    Chasmosaurus

    6.2ft

    Ankylosaurus

    7.22ft

    Dravidosaurus

    4.1ft

Teacher pug

Adding and subtracting decimal numbers

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