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3-digit addition without regrouping
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215 + 251 = ?
466
Oops!
Okay!
128 + 120 = ?
248
Oops!
Okay!
131 + 325 = ?
456
Oops!
Okay!
347 + 110 = ?
457
Oops!
Okay!
220 + 412 = ?
632
Oops!
Okay!
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