一、凑十凑百5题287228722872192119211921366436643664554555455545831783178317二、带符号搬家同级加减交换位置5题3756−273756-273756−2784−291684-291684−29166528−456528-456528−4591−35991-35991−35943−185743-185743−1857三、添括号、去括号巧算5题78−(2815)78-(2815)78−(2815)95−(35−12)95-(35-12)95−(35−12)46(54−19)46(54-19)46(54−19)63−(2318)63-(2318)63−(2318)52(48−26)52(48-26)52(48−26)四、连减变减和a−b−ca−(bc)a-b-ca-(bc)a−b−ca−(bc)5题100−23−77100-23-77100−23−7785−16−2485-16-2485−16−2492−31−992-31-992−31−976−42−876-42-876−42−868−15−2568-15-2568−15−25五、基准数求和相近数字凑整5题989910110298991011029899101102515249485152494851524948103971059510397105951039710595293031293031293031788082788082788082参考答案100\boldsymbol{100}10040\boldsymbol{40}40100\boldsymbol{100}100100\boldsymbol{100}100100\boldsymbol{100}10037−275610566637-27561056\boldsymbol{66}37−27561056668416−29100−29718416-29100-29\boldsymbol{71}8416−29100−297165−452820284865-45282028\boldsymbol{48}65−4528202848919−35100−3565919-35100-35\boldsymbol{65}919−35100−35654357−18100−18824357-18100-18\boldsymbol{82}4357−18100−188278−28−1550−153578-28-1550-15\boldsymbol{35}78−28−1550−153595−351260127295-35126012\boldsymbol{72}95−35126012724654−19100−19814654-19100-19\boldsymbol{81}4654−19100−198163−23−1840−182263-23-1840-18\boldsymbol{22}63−23−1840−18225248−26100−26745248-26100-26\boldsymbol{74}5248−26100−2674100−(2377)100−1000100-(2377)100-100\boldsymbol{0}100−(2377)100−100085−(1624)85−404585-(1624)85-40\boldsymbol{45}85−(1624)85−404592−(319)92−405292-(319)92-40\boldsymbol{52}92−(319)92−405276−(428)76−502676-(428)76-50\boldsymbol{26}76−(428)76−502668−(1525)68−402868-(1525)68-40\boldsymbol{28}68−(1525)68−4028(98102)(99101)200200400(98102)(99101)200200\boldsymbol{400}(98102)(99101)200200400(5149)(5248)100100200(5149)(5248)100100\boldsymbol{200}(5149)(5248)100100200(10397)(10595)200200400(10397)(10595)200200\boldsymbol{400}(10397)(10595)20020040030×39030×3\boldsymbol{90}30×39080×324080×3\boldsymbol{240}80×3240巧算口诀小结凑整看见互补数先相加凑10/100搬家只有加减数字带着前面符号随便换顺序去括号括号前是减号去括号里面加减要变号加号不变号连减两个减数先加起来再用被减数一起减基准数都靠近同一个数用平均数×个数快速算总和