Cross the Swamp - addition and subtraction
Terminator Addition
Terminator Subtraction
Addition Pyramid
Whack a Mole - be sure to increase the steps!
Rags to Riches - can you win a million dollars?
Ghostblasters single digit subtraction
Ghostblasters - two digit subtraction
Subtraction - using standard written form
Subtraction Machine
Soccer Shootout - Subtract 10
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