Adding and Subtracting Decimals
Learning Objective
I can add and subtract decimals using the standard algorithm.
Key Concepts
When adding or subtracting decimals, the first step is to line up the decimals to ensure that all the places are lined up correctly.
When adding or subtracting decimals, you can use placeholder zeros to the right of a decimal without changing its value, which helps to line up the numbers.
When subtracting decimals, remember to borrow if the top digit is smaller than the bottom digit; do not simply drop the bottom number.
Practice Questions
This lesson includes 12 practice questions to reinforce learning.
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1. What is the most important step to remember when adding or subtracting decimals?
2. Why is it acceptable to add placeholder zeros to the right of a decimal when adding or subtracting?
3. Solve: 5.2 + 3.89
...and 9 more questions
Educational Video
Adding and Subtracting Decimals: A Step-By-Step Review | How to Add and Subtract Decimals
Math with Mr. J