find the sum of the numbers using the most convenient grouping:

1871,4477,3459,2673,1223

1871 + 4477 + 3459 + 2673 + 1223

= (1871 + 3459) + (4477 + 1223) + 2673

= 5330 + 5700 + 2673

= (5330 + 5700) + 2673

= 11030 + 2673

= 13703