Tape Diagrams: 2-Digit Addition and Subtraction | Grade 2 Special | 2m 20s Your child continues to use tape diagrams as a visual tool to solve word problems.

Teaching in Room 9 Add/Subtract with Regrouping 2 | 2nd Grade Math Special | 28m 49s | CC In this lesson, students go over addition and subtraction with regrouping using different strategies to ...

Steps in addition and subtraction of four-digit numbers were motivated by the size of the blocks and then were carried out with the blocks; each step was immediately recorded with base-ten numerals.