Why approximate such a way

The corn crops of Moses, each of which is 27 acres, have been damaged by the rootworm pest. 3/11 of Cornfield A has been destroyed. While, 8/25 of the crop in cornfields B and C was lost. Cornfield D has been totally ruined and only 1/9 of cornfield E was left undamaged. 1/6 and 1/7 of cornfields F...