题目内容
估算.
142×5≈______;302×6≈______;
308×9≈______;398×9≈______;
99×8≈______;319×5≈______.
142×5≈______;302×6≈______;
308×9≈______;398×9≈______;
99×8≈______;319×5≈______.
142×5≈700;302×6≈1800;
308×9≈2700;398×9≈3600;
99×8≈800;319×5≈1500.
308×9≈2700;398×9≈3600;
99×8≈800;319×5≈1500.
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