题目内容
| 请你估算一下. 52×7≈ | 61×8≈ | 89×5≈ |
| 21×5≈ | 298×3≈ | 204×5≈ |
(1)52×7,
≈50×7,
=350;
(2)61×8,
≈60×8,
=480;
(3)89×5,
≈90×5,
=450;
(4)21×5,
≈20×5,
=100;
(5)298×3,
≈300×3,
=900;
(6)204×5,
≈200×5,
=1000.
≈50×7,
=350;
(2)61×8,
≈60×8,
=480;
(3)89×5,
≈90×5,
=450;
(4)21×5,
≈20×5,
=100;
(5)298×3,
≈300×3,
=900;
(6)204×5,
≈200×5,
=1000.
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