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Study
Simple addition and subtraction
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459 - 25
434
Oops!
Okay!
329 - 4
325
Oops!
Okay!
231 + 25
256
Oops!
Okay!
153 + 4
157
Oops!
Okay!
528 - 127
401
Oops!
Okay!
375 + 123
498
Oops!
Okay!
249 - 125
124
Oops!
Okay!
418 - 6
412
Oops!
Okay!
254 + 3
257
Oops!
Okay!
453 - 41
412
Oops!
Okay!
137 + 340
477
Oops!
Okay!
242 - 121
121
Oops!
Okay!
623 + 250
873
Oops!
Okay!
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