1、30+50= 28- 12= 46+21= 36- 25= 53+20= 44- 24= 67+23= 56- 17= 48+22= 35- 28= 25+47= 42- 16=,看谁算得又对又快,侍从: 32只 卫兵: 45只 保育员:57只 清洁工:29只,57,?,1.保育员和清洁工一共有多只?,29,+ =,(只),50+20=70,7+9=16,70+16=86,57+20=77,77+9=86,29+1=30,57+30=87,871=86,77,2.侍从和卫兵一共有多只?,32 + 45 =,(只),3.保育员比清洁工多多只?,28,57 29 =,(只),4.卫兵比侍从多多只?
2、,13,45 32 =,(只),口算下面各题,并说说你是怎么想的。,32+40= 54+30= 36 -20= 52 -10= 32+46= 54+38= 32 -24= 52 -18=,72,84,16,42,78,92,8,34,32+( )=74 ( )+62=9729+( )=51 ( )+21=7683- ( )=62 ( )- 25=1655- ( )=37 ( )-22=35,42,35,22,55,21,41,18,57,37+31= 23+56= 53+19= 27+34= 42+36= 66+25= 62-19= 33-15= 97-79= 34-14= 69-31= 91-23= 24+36= 32+25= 42+57= 56+38= 36+45= 45+17= 57-39= 52-38= 32-23= 98-73= 55-37= 92-76=,