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Examples1:
Regrouping
Regroup or Regrouping is a term use  in addition and
subtraction when carrying or borrowing is involve.
20+6= 26 NO REGROUPING     53+6=59 NO REGROUPING
24+9=33 IS REGROUPING    58+5=63 IS REGROUPING
Examples2:
Example 2 involves carrying, so you will have regroup
the numbers.