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How do you do the casting out nines?
Casting Out Nines..the easiest way to check math computation
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Cast Out Nines Trick | How To Check Answers After Multiplication
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How to check multiplication results - Cast Out Nines Trick - YouTube
Subtraction-fest 12 ~ Checking Your Subtractions By Casting Out Nines
Casting Out Nines: A Simple Way to Check Your Math | Video