口算第一关56+20= 67+3= 25-4= 43+40=56+2= 76+3= 52-4= 34+40=56+7= 95-60= 35+3= 54+9=56-20= 69-50= 35-3= 54-9=56-2= 60+37= 59-30= 64-7=56-7= 67-30= 48+6= 45+8=口算第二关50-9= 41-6= 8+73= 63-20=72-5= 20+71= 5+57= 53-4=89+5= 34-8= 88-70= 40+29=口算第三关20+80= 28+8= 61-6= 4+17=32-9= 58+5= 21-7= 66-9=37+5= 6+85= 45-8= 95-6=7+58= 27-5= 90-60= 79-40=竖式计算第一关43-6= 45+39= 9+33= 70-49=竖式计算第二关73-17= 63+29= 71-7= 98-90=竖式计算第三关25+52= 36+64= 42-28= 74-7=开动脑筋4 6+ 263 8+ 275 8- 217 5- 42 7估计下列算式各是几十多65-3 ( )十多 65-9 ( )十多65+3 (