1 口算.ppt

1、480+20=,口算,500,78+120=,198,9003=,300,980-60=,920,5409=,60,789-60=,729,78+30=,86,7209=,80,5000+600=,5600,180+560=,740,60003=,2000,2400-1600=,800,430+570=,1000,650+325=,930,4206= 2404= 1602= 2709= 1504= 1208= 3602= 244+30=,450-20= 2804= 1705= 420+25= 9003= 1280= 650+13= 2505=,70,60,80,30,600,960,180,2

2、74,430,70,850,445,300,960,663,50,350+200= 2340= 1660= 2920= 1500-40= 1208= 362= 2403=,4520= 2803= 1750= 4025= 4907= 1280= 60013= 41600=,550,920,960,580,1460,960,72,80,900,840,850,1000,70,960,7800,6400,408-20=,口算,300,4004-100=,0,36+380=,398,907-560=,70,2406+200=,240,990-610=,200,780+35=,595,420+390=,

3、690,51+74=,79,240+390=,510,600-4206=,530,720-408=,400,100-3208=,60,72+69=,126,4520= 2350= 16030= 2802= 1505= 1208= 3603= 2440=,5520= 2103= 2750= 4023= 9011= 1211= 1115= 1117=,900,1150,4800,140,30,960,120,960,1100,70,1350,920,990,132,165,187,7020= 2540= 502= 1258= 12580= 1254= 2520= 2504=,10050= 2502

4、0= 2050= 25050= 8500= 12060= 60013= 16004=,1400,1000,100,1000,10000,500,500,1000,2,5000,1000,5,4000,2,7800,400,308+20=,口算,260,440+80=,240,366+300=,306,570+60=,410,908+20=,740,390+60=,330,708+30=,590,40+36=,58,50+74=,78,20+3208=,60,60+64=,84,100+4008=,50,50+56=,80,70+64=,94,5020= 2530= 15060= 2930= 1

5、5600= 1208= 36020= 24030=,50100= 28020= 14050= 4250= 8210= 12080= 600130= 401600=,1000,750,9000,870,9000,960,7200,7200,5000,5600,7000,1000,1680,9600,78000,64000,0200= 8050= 1630= 280+20= 150-6= 1203= 3604= 2440=,5520= 2103= 2750= 4002= 9011= 1711= 1115= 1119=,0,4000,480,300,144,360,90,960,1100,70,1350,200,990,187,165,209,88-20=,口算,44,44-10=,6,36+38=,56,97-56=,7,94+20=,56,99-61=,20,78+35=,91,42+39=,69,51+