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