估一估,算一算.
|
(1)389 ×2= |
(2)812 ÷4= |
估一估,算一算.
|
(1)28 ×7= |
(2)596 ÷2= |
探索规律计算
|
(1)9 +3 |
(2)9 +4 |
|
(3)9 +5 |
(4) □+6 |
|
(5) □+□ |
|
找规律巧做题包
|
(1)8 +2=□ |
(2)8 +3=□ |
(3)8 +4=□ |
|
(4)8 +5=□ |
(5)8 +□=□ |
(6)□+□ =□ |