题目内容
| 估算. 498×21≈ | 878×6≈ |
| 616×22≈ | 199×19≈ |
(1)498×21,
≈500×20,
=10000;
(2)878×6,
≈900×6,
=5400;
(3)616×22,
≈600×20,
=12000;
(4)199×19,
≈200×20,
=4000.
≈500×20,
=10000;
(2)878×6,
≈900×6,
=5400;
(3)616×22,
≈600×20,
=12000;
(4)199×19,
≈200×20,
=4000.
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