a) 468+124=592
(468+124): 2=592: 2= 296
(468+124): 2=468: 2 +124: 2= 234+62=297
(468+124) x4=2368
(468+124) x4= 468x4+124x4
1872+496=2368
b) 238+106= 344
(238+106): 2= 344:2=172
(238+106): 2= 238: 2+106: 2 =119+ 53=172
(238+106) x4=344x4=1376
(238+106) x4=238x4+106x4=952+424=1372
c) 1000+500= 1500
(1000+500): 2=1500: 2 = 750
(1000+500): 2=1000:2+500:2=500+250=750
(1000+500) x4=1500x4= 6000
(1000+500) x4 =1000x4+500x4=4000+ 2000
=6000
