Respuesta :

11. 8.73 x 6.01....estimation : 9 x 6 = 54
13. 197.4 x 2.85...estimation : 197 x 3 = 591
15. 479.2 x 3.2...estimation : 479 x 3 = 1437

all I did was round the numbers to the nearest whole number, then just multiplied