= (1282 + 4218) + (2005 + 995) - ( 3546 + 454)
= 5500 + 3000 - 4000
= 4500
1282+2005-3546+4218-454+995
= (1282+4218)+(2005+995)-(3546+454)
= 6000+3000-4000
=9000-4000
=5000
1282 + 2005 - 3546 + 4218 - 454 + 995
= ( 1282 + 4218 ) - ( 2005 + 995 ) - ( 3546 + 454 )
= 5500 - 3000 - 4000
= - 1500