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Study
3-by-3 Vertical Subtraction
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Restart
Subtract
137
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Okay!
Subtract
21
Oops!
Okay!
Subtract
570
Oops!
Okay!
Subtract
383
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Okay!
Subtract
85
Oops!
Okay!
Subtract
201
Oops!
Okay!
Subtract
223
Oops!
Okay!
Subtract
223
Oops!
Okay!
Subtract
244
Oops!
Okay!
Subtraction
451
Oops!
Okay!
Subtract
312
Oops!
Okay!
Subtract
150
Oops!
Okay!
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