Addition
Opposite Change Rule or Compensating - I do this one quite a bit.
Subtraction
Trade First Method with Base 10 Blocks
Counting Up Subtraction - I’ve always done this one, didn’t know what the name was.
Partial Differences Subtraction
Same Change Subtraction - compensating but subtraction
Multiplication and Division (Solutions Strategies Chart)
Multiplication
Others
Line Multiplication - Can only watch on youtube
Unique Strategy for 1 x 1 multiplication - also youtube
Finger multiplication - youtube and very unique
Division
Partial Quotient Division - number subtraction method