Ellis showed a subtraction problem, performed both using the traditional regrouping, or borrow-and-carry, algorithm and using an example from the common core. Here’s a screenshot of the two methods.

From the Grade 4 standards for "Number and Operations in Base Ten": That "fluently add and subtract multidigit whole numbers using the standard algorithm" is exactly the borrowing and carrying ...

Represent teen numbers with addition and subtraction equations involving one 10. Represent 10 using a number bond and 10-frame with a missing addend. Use Notice and Wonder with a 10-frame ...

Our learning intention today is to solve subtraction problems using blocks and pictures to show our understanding. When we hear the word subtraction, it simply means we are taking away.

Algorithms have become integral ... He provided the first detailed explanations for using decimal notation to perform the four basic operations (addition, subtraction, multiplication, division ...