7.在○填上“>”“<”“=”.
18×2○18×3 | 42×2○42÷2 | 605-276-128○605-(276+128) |
1+2+3○1×2×3 | 56÷7+6○56-7×6 | 90+0○90-0 |
6.用脱式计算
①100-(72+28) | ②25+3×4 | ③468+376-168 |
④88÷4+15 | ⑤(81-45)÷4 | ⑥477+140+103 |
5.用竖式计算
①600-233 | ②162+378+294 | ③615-317-209 |
④346+199 | ⑤475+260+149 | ⑥456-278-132 |
4.直接写得数
0 160961 160969 160975 160979 160985 160987 160991 160997 160999 161005 161011 161015 161017 161021 161027 161029 161035 161039 161041 161045 161047 161051 161053 161055 161056 161057 161059 161060 161061 161063 161065 161069 161071 161075 161077 161081 161087 161089 161095 161099 161101 161105 161111 161117 161119 161125 161129 161131 161137 161141 161147 161155 199269
20+30= | 12×5= | 15×4= | 60÷3= | 10-10×1= | 10+10×1= |
70+39= | 70-38= | 80÷8= | 90-80= | 6+8×3= | 6×8-3= |