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 Lesson Plan for Grade 5

Name: Adding and Subtracting Decimals
Author: Insta~Lesson

I can add and subtract decimals to the hundredths place.

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.