算一算．
(分数，先填分子，后填分母)|
(1) |
(2) |
|
(3) |
(4) |
算一算．
(分数，先填分子，后填分母)|
(1) |
(2) |
|
(3) |
(4) |
估一估，算一算．
|
(1)886 ÷3=( )……( ) |
|
(2)609 ÷2=( )……( ) |
估一估，算一算．
|
(1)287 ×5= |
(2)72 ×8= |
估一估，算一算．
|
(1)67 ×3= |
(2)823 ×6= |
估一估，算一算．
|
(1)389 ×2= |
(2)812 ÷4= |
估一估，算一算．
|
(1)28 ×7= |
(2)596 ÷2= |