What is the most important thing to remember when adding or subtracting decimal numbers?

To make sure that the numbers are lined up by their place value.

Adding and Subtracting Decimals

Grade 5 · Math · 39 min

I can add and subtract decimals to the hundredths place.

Math Defined · 3:52

Add and Subtract Decimal Numbers | Math Defined with Mrs. C

3 key concepts

1
When adding or subtracting decimal numbers, it is important to line up the numbers by their place value, which also lines up their decimal points.
2
When you add or subtract decimal numbers, bring the decimal point straight down into your answer.
3
In the video's problem, the correct amount of change should have been $11.66, but the cashier gave back $12.34.

8 questions · Multiple choice & Short answer

Quick comprehension check

“Sarah bought a book for $6.75 and a pen for $2.18. What was the total cost? Show your work.”

Get all 3 ready-to-use resources:

Teacher GuideComplete lesson plan

Student DocPrintable student handouts

SlidesReady-to-use presentation