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12 November, 02:53

Make a ballpark estimate. Use the column-addition method to add.

compare your answer with your estimate to see if your answer make sense.

89

+47

=

ballpark estimate:

634

+86

=

ballpark estimate:

148

+77

=

ballpark estimate:

481

+239

=

ballpark estimate:

746

+827

=

ballpark estimate:

508

+1,848

=

ballpark estimate

+3
Answers (1)
  1. 12 November, 02:56
    0
    136; 720; 235; 720; 1 573; 2 356
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