Adding and Subtracting Decimals
aligned to Apply And Extend Previous Understandings Of Numbers To The System Of Rational Numbers
Learning Objective
I can add and subtract decimals using models and strategies based on place value.
Lesson Flow
Watch Video
Adding and Subtracting Decimals: A Step-By-Step Review | How to Add and Subtract Decimals
Math with Mr. J
Guided Notes
Key concepts students will learn:
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When adding or subtracting decimals, the first step is to line up the decimals to ensure that all the places are lined up correctly.
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Placeholder zeros can be added to the right of a decimal without changing its value; this can help to line up the numbers and avoid mistakes when adding or subtracting.
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When subtracting decimals, remember to borrow if the top digit is smaller than the bottom digit; avoid the common mistake of just dropping the bottom number.
Practice
8 questions • Multiple choice & Short answer
Exit Ticket
“Solve 35.6 + 18.74. Show your work, lining up the decimals and using a placeholder zero if needed.”
Teacher Guide
Get the complete package:
- Answer keys for all questions
- Differentiation strategies
- Extension activities
- Printable student handouts
