Addition and subtraction missing value problems (K-A)

S#	Lecture	Course	Institute	Instructor	Discipline
1	Missing number for 3-digit addition within 1000 (K-A)	Addition and subtraction missing value problems (K-A)	Khan Academy		Basic and Health Sciences
2	Missing number for 3-digit subtraction within 1000 (K-A)	Addition and subtraction missing value problems (K-A)	Khan Academy		Basic and Health Sciences

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