A previous version of this post incorrectly characterized the way the standards teach subtraction. Students learn regrouping and the standard algorithm in 4 th grade.

Instead, it captures some of the underlying aspects of subtraction and place value ... making it easier for them to work with the standard algorithms later. Read next BI Tech Memo ...

In California, students learned the algorithms for addition, subtraction ... Zimba wrote that the 4th grade standard is a “culminating” standard, and that teachers can begin introducing ...

An algorithm in C for calculating linear acceleration necessary to run a step motor smoothly that requires only addition and subtraction. This code accompanies the article “Linear motor control ...