1)334-286+166=(334+166)-286=500-286=214
2)518-135-265=518-(135+265)=518-400=118
3)20*399*50=20*50*399= 1000*399=399000
4)93*28-28*53=28*(93-53)=28*40=1120
1)334-286+166=(334+166)-286=500-286=214
2)518-135-265=518-(135+265)=518-400=118
3)20*399*50=20*50*399= 1000*399=399000
4)93*28-28*53=28*(93-53)=28*40=1120