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(4 Lectures Available)

S#	Lecture	Course	Institute	Discipline
1	Adding 53+17 by making a group of 10 (K-A)	Strategies for adding and subtracting within 100 (K-A)	Khan Academy	Basic and Health Sciences
2	Adding by making a group of 10 (K-A)	Strategies for adding and subtracting within 100 (K-A)	Khan Academy	Basic and Health Sciences
3	Addition and subtraction with number lines (K-A)	Strategies for adding and subtracting within 100 (K-A)	Khan Academy	Basic and Health Sciences
4	Strategies for adding 2-digit numbers (K-A)	Strategies for adding and subtracting within 100 (K-A)	Khan Academy	Basic and Health Sciences