1) (176+343)-243=176+(343-243)=176+100=276
2) (684+915)-484=(684-484)+915=200+915=1115
3) (259+101)-59=(259-59)+101=200+101=301
4) 1287-(487+164)=(1287-487)-164=800-164=636
5) 971-(235+371)=(971-371)-235=600-235=365
6) 5393-(1393+158)=(5393-1393)-158=4000-158=3842
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2. (684+915)-484 = (684-484)+915 = 200+915 = 1115
3. (259+101)-59 = (259-59)+101 = 200 + 101 = 301
4. 1287-(487+164) = (1287-487)-164 = 800-164 = 636
5. 971-(235+371) = (971-371)-235 = 600-235 = 365
6. 5393-(1393+158) = (5393-1393)-158 = 4000-158 = 3842
1) (176+343)-243=176+(343-243)=176+100=276
2) (684+915)-484=(684-484)+915=200+915=1115
3) (259+101)-59=(259-59)+101=200+101=301
4) 1287-(487+164)=(1287-487)-164=800-164=636
5) 971-(235+371)=(971-371)-235=600-235=365
6) 5393-(1393+158)=(5393-1393)-158=4000-158=3842