Explain why addition and subtraction strategies work, using place value and the properties of operations. (Explanations may be supported by drawings or objects.)
Related Lessons
2nd Grade
Add and Subtract 3-Digit Numbers
Lesson 404
Join Mrs. McCartney for a Number Talk with D.C. and Value Pak. We'll add and subtract three-digit numbers with Springling and Minni and Subbi.
2nd Grade
Subtraction on an Open Numberline
Lesson 214
Join Mrs. McCartney for an addition number talk with D.C.! Get your hopping skills ready so you can see our Math Might friend Springling to hop forward or back on the numberline to subtract.
