lesson
Explaining Your Addition Reasoning Using Place Value
Explain how place value helps you add two-digit numbers with regrouping.

Explain how place value helps you add two-digit numbers with regrouping.
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5 lessons
Master two-digit addition with and without regrouping, using both horizontal and vertical methods.
communicate mathematical ideas, reasoning, and their implications using multiple representations, including symbols, diagrams, graphs, and language as appropriate;
display, explain, and justify mathematical ideas and arguments using precise mathematical language in written or oral communication.