Question

Grupati convenabil termenii si calculati.

a) 400+3750+1600+250
5090+3900+10+4100
30420+21095+12580+48005

b) 178+1196+2084+1304+822+7916
2125+12259+10167+3175+2141+4133
122334+42212+511766+57788

Answer 1

a) 400+3750+1600+250=(400+600)+(3750+250)=1000+4000=5000

5090+3900+10+4100=(5090+10)+(3900+4100)=6000+8000=14000

30420+21095+12580+48005=(30420+12580)+(21095+48005)=43000+89100=132100

b) 178+1196+2084+1304+822+7916=(178+822)+(1196+1304)+(2084+7916)=1000+2500+10000=13500

2125+12259+10167+3175+2141+4133=(2125+3175)+(12259+2141)+(10167+4133)=5300+14400+14300=340000

122334+42212+511766+57788 =(122334+511766)+(42212+57788)=634100+100000=734100

Answer 2

a)   400+3750=4150+160= 5750+250= 6000+5090= 11,090+3900= 14,990+10=15,000+4,100=19,100+ 30,420= 49,520+21095= 70,615+12580= 83,195+48005=131,200