Lesson: Mental Subtraction of Numbers up to 10,000 Mathematics • 4th Grade
In this lesson, we will learn how to use different strategies to subtract numbers with up to four digits efficiently.
Sample Question Videos
Natalie wants to calculate . She thinks that if she changes the subtraction to , it will be easier to calculate.
Using Natalie’s method, what is ?
Chloe is calculating .
She knows that it is easy to subtract 10s, so she solves the calculation in two steps: and .
Following Chloe’s method, what is ?
What is 255 less than 3,565?