Lesson: Estimating Differences between Three-Digit Numbers: Compatible Numbers Elementary School • Mathematics • 3rd GradeMathematics
In this lesson, we will learn how to use compatible numbers like 25, 50, 75, and 100 to estimate the value of differences with numbers up to 1000.
Sample Question Videos
Charlotte bought a 373-page notebook for her assignment. She completed her assignment in 127 pages. Use compatible numbers to estimate the number of blank pages that are left in the notebook.
Use compatible numbers to estimate the following:
A student used compatible numbers to estimate the result of a subtraction operation, as shown.
What is the actual subtraction operation result?
What is the student’s estimation?