专项11《除数是两位数的除法—同乘、同除的简便运算》计算专项(计算专项)-四年级数学上册(含答案)(人教版)
专项11《除数是两位数的除法—同乘、同除的简便运算》计算专项
一、知识方法巩固
1. 在除法运算中,被除数和除数同时( )或( )同一个数(0除外),商不变。
2. 三位数除以两位数时,如果被除数和除数末尾都有0,可以同时划去( )个0,使计算更简便。
3. 被除数和除数同时除以一个自然数时,这个数必须是它们的( )。
4. 简便计算后,可以用( )×( )=( )的方法来验算。
5. 当除数是25时,可以把被除数和除数同时( )4,使计算简便。
6. 当除数是50时,可以把被除数和除数同时( )2,使计算简便。
二、分题型计算训练
1. 三位数除两位数两边可以同时除以整十的简便运算,并验证
(1)240 ÷ 60 = ( )简便计算:240 ÷ 60 = 24 ÷ 6 = ( )
(2)360 ÷ 90 = ( )简便计算:360 ÷ 90 = 36 ÷ 9 = ( )
(3)480 ÷ 80 = ( )简便计算:480 ÷ 80 = 48 ÷ 8 = ( )
(4)630 ÷ 70 = ( )简便计算:630 ÷ 70 = 63 ÷ 7 = ( )
(5)720 ÷ 80 = ( )简便计算:720 ÷ 80 = 72 ÷ 8 = ( )
(6)810 ÷ 90 = ( )简便计算:810 ÷ 90 = 81 ÷ 9 = ( )
(7)560 ÷ 70 = ( )简便计算:560 ÷ 70 = 56 ÷ 7 = ( )
(8)450 ÷ 50 = ( )简便计算:450 ÷ 50 = 45 ÷ 5 = ( )
(9)640 ÷ 80 = ( )简便计算:640 ÷ 80 = 64 ÷ 8 = ( )
(10)750 ÷ 50 = ( )简便计算:750 ÷ 50 = 75 ÷ 5 = ( )
(11)840 ÷ 60 = ( )简便计算:840 ÷ 60 = 84 ÷ 6 = ( )
(12)960 ÷ 40 = ( )简便计算:960 ÷ 40 = 96 ÷ 4 = ( )
(13)880 ÷ 80 = ( )简便计算:880 ÷ 80 = 88 ÷ 8 = ( )
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(14)780 ÷ 60 = ( )简便计算:780 ÷ 60 = 78 ÷ 6 = ( )
(15)920 ÷ 40 = ( )简便计算:920 ÷ 40 = 92 ÷ 4 = ( )
2. 三位数除两位数两边可以同时除以一个自然数的简便运算,并验证
(1)144 ÷ 36 = ( )简便计算:144 ÷ 36 = ÷
= ( )÷( )= ( )
(2)168 ÷ 42 = ( )简便计算:168 ÷ 42 = ÷
= ( )÷( )= ( )
(3)180 ÷ 45 = ( )简便计算:180 ÷ 45 = ÷
= ( )÷( )= ( )
(4)192 ÷ 48 = ( )简便计算:192 ÷ 48 = ÷
= ( )÷( )= ( )
(5)216 ÷ 54 = ( )简便计算:216 ÷ 54 = ÷
= ( )÷( )= ( )
(6)228 ÷ 57 = ( )简便计算:228 ÷ 57 = ÷
= ( )÷( )= ( )
(7)252 ÷ 63 = ( )简便计算:252 ÷ 63 = ÷
= ( )÷( )= ( )
(8)264 ÷ 66 = ( )简便计算:264 ÷ 66 = ÷
= ( )÷( )= ( )
(9)276 ÷ 69 = ( )简便计算:276 ÷ 69 = ÷
= ( )÷( )= ( )
(10)288 ÷ 72 = ( )简便计算:288 ÷ 72 = ÷
= ( )÷( )= ( )
(11)312 ÷ 78 = ( )简便计算:312 ÷ 78 = ÷
= ( )÷( )= ( )
(12)324 ÷ 81 = ( )简便计算:324 ÷ 81 = ÷
= ( )÷( )=
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( )
(13)336 ÷ 84 = ( )简便计算:336 ÷ 84 = ÷
= ( )÷( )= ( )
(14)348 ÷ 87 = ( )简便计算:348 ÷ 87 = ÷
= ( )÷( )= ( )
(15)360 ÷ 90 = ( )简便计算:360 ÷ 90 = ÷
= ( )÷( )= ( )
3. 三位数除两位数两边可以同时乘以一个自然数的简便运算,并验证
(1)125 ÷ 25 = ( )简便计算:125 ÷ 25 = ÷
= ( )÷( )= ( )
(2)150 ÷ 25 = ( )简便计算:150 ÷ 25 = ÷
= ( )÷( )= ( )
(3)175 ÷ 25 = ( )简便计算:175 ÷ 25 = ÷
= ( )÷( )= ( )
(4)225 ÷ 25 = ( )简便计算:225 ÷ 25 = ÷
= ( )÷( )= ( )
(5)250 ÷ 25 = ( )简便计算:250 ÷ 25 = ÷
= ( )÷( )= ( )
(6)275 ÷ 25 = ( )简便计算:275 ÷ 25 = ÷
= ( )÷( )= ( )
(7)300 ÷ 25 = ( )简便计算:300 ÷ 25 = ÷
= ( )÷( )= ( )
(8)325 ÷ 25 = ( )简便计算:325 ÷ 25 = ÷
= ( )÷( )= ( )
(9)350 ÷ 25 = ( )简便计算:350 ÷ 25 = ÷
= ( )÷( )= ( )
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