Understand subtraction as an unknown-addend problem. For example, subtract 10 – 8 by finding the number that makes 10 when added to 8.
Related Lessons
1st Grade
Story Problems and Equations
Lesson 318
Join Mrs. Markavich with a Mystery Math Mistake - see if you can help D.C. and Value Pak with an addition mistake! We'll also solve word problems and write equations to match.
1st Grade
Story Problems with Length
Lesson 316
Join Mrs. Markavich with a Mystery Math Mistake - see if you can help Professor Barble with his word problem. We'll also solve measurement word problems and comparie lengths.
