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241四年级数学专项练习系列一之练习1 附答案

 dongfang3216 2020-10-22

241四年级数学专项练习系列一之练习1

1、根据乘法定律,在(    )里填上适当的数

303×786=(        )×303                                     a×(        )=b×a

34+25+66=(        )+(______+______)       125×95×8=95×(______×______)

(93+28)×11=93×(        )+28×(        )               a×(b-c)=(    )×(    )-(    )×(    )

×+×=(______+______)×________

2、竖式计算并用交换律验算

503×236=                 验算:                      3679+824=                     验算:

3、递等式计算能简便的要简便

324+167+233                            333+554+667+146                    240+(74+260)

25×86×4                              2×78×50                                    125×(8×4)×25

(25+9)×8                              29×175+25×29                         148×17-48×17

125×88                                 101×98                                       101×87-87

241四年级数学专项练习系列一之练习1 答案

1、根据乘法定律,在(    )里填上适当的数

303×786=( 786 )×303                                      a×(  b )=b×a

34+25+66=( 25  )+(__34_+__66__)              125×95×8=95×(__125_×__8___)

(93+28)×11=93×( 11   )+28×(   11  )              a×(b-c)=(a )×( b  )-( a )×( c )

×+×=(____+_____)×______

2、竖式计算并用交换律验算

503×236=                 验算:                      3679+824=                     验算:

118708                                                       4503

3、递等式计算能简便的要简便

324+167+233                       333+554+667+146               240+(74+260)

724                                 1700                                     574

25×86×4                        2×78×50                              125×(8×4)×25

8600                               7800                                     100000

(25+9)×8                        29×175+25×29                    148×17-48×17

272                                 5800                                     1700

125×88                                 101×98                           101×87-87

11000                                   9898                               8700

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