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Study
2-by-2 Vertical Subtraction
0
%
0
0
0
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Restart
Subtract
12
Oops!
Okay!
Subtract
42
Oops!
Okay!
Subtract
33
Oops!
Okay!
Subtract
62
Oops!
Okay!
Subtract
42
Oops!
Okay!
Subtract
31
Oops!
Okay!
Subtract
23
Oops!
Okay!
Subtract
31
Oops!
Okay!
Subtract
20
Oops!
Okay!
Subtract
32
Oops!
Okay!
Subtract
26
Oops!
Okay!
Subtract
32
Oops!
Okay!
Subtract
45
Oops!
Okay!
Subtract
22
Oops!
Okay!
Subtract
32
Oops!
Okay!
Subtract
7
Oops!
Okay!
Subtract
32
Oops!
Okay!
Subtract
9
Oops!
Okay!
Subtract
63
Oops!
Okay!
Subtract
15
Oops!
Okay!
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