估算．
|
(1)7 ×199≈ |
(2)8 ×413≈ |
估算．
|
(1)820 ×37≈ |
(2)392 ×231≈ |
估算．
|
(1)345 ×38≈ |
(2)20 ×99≈ |
估算．
|
(1)89 ×34≈ |
(2)513 ×26≈ |
估算．
|
(1)194 ×32≈ |
(2)48 ×502≈ |
估一估，算一算．
|
(1)246 ×24≈ |
(2)850 ×40≈ |
估一估，算一算．
|
(1)106 ×27≈ |
(2)178 ×16≈ |
估算．
|
(1)57 ×62≈ |
(2)78 ×12≈ |
