Two-Digit Addition With Regrouping Ones to Tens
Add two-digit numbers vertically and regroup 10 ones into 1 ten.

Add two-digit numbers vertically and regroup 10 ones into 1 ten.
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5 lessons
Master two-digit addition with and without regrouping, using both horizontal and vertical methods.
select tools, including real objects, manipulatives, paper and pencil, and technology as appropriate, and techniques, including mental math, estimation, and number sense as appropriate, to solve problems;
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.