Education Technology

Adding and Subtracting Decimals

Published on 06/10/2005

Activity Overview

Students' learn about adding and subtracting decimals.

Before the Activity

Review place value for ones, tenths, and hundredths. Ask: Can you write 8.4 as a decimal in the hundredths? (8.40)

During the Activity

On board put 10 examples of adding and subtracting decimals.

Students work in pairs to add or subtract. One student works with pencil and paper the other calculator.

Check answers.

Then trade places with 10 new examples.

Students reply in writing.

What they found to be an easier way to find the answer and why?

After the Activity

Review student results:

  • As a class, discuss questions that appeared to be more challenging
  • Re-teach concepts as necessary