Content Analysis: Here is the explanation for problems 8 This video addresses the kindergarten

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[K.OA.1-2.0] Basic Addition/ Subtraction - Common Core Standard
[K.OA.1-2.0] Basic Addition/ Subtraction - Common Core Standard - Word Problem
[K.OA.1-1.2] Basic Addition/ Subtraction - Common Core Standard
[K.OA.1-2.2] Basic Addition/ Subtraction - Common Core Standard
[K.OA.1-1.0] Basic Addition/ Subtraction - Common Core Standard - Word Problem
[K.OA.1-1.0] Basic Addition/ Subtraction - Common Core Standard
[1.OA.1-2.0] Add and Subtract within 20 - Common Core Standard - Practice Problem
[1.OA.1-2.0] Add and Subtract within 20 - Common Core Standard
Understanding Common Core Math (Standard K.OA.A.1)
[1.OA.1-2.0] Add and Subtract within 20 - Common Core Standard - Word Problem
Understanding Common Core Math (Standard K.OA.A.2)
How Common Core subtraction works