问题
填空题
估算.
142×5≈______;302×6≈______;
308×9≈______;398×9≈______;
99×8≈______;319×5≈______.
答案
142×5≈700;302×6≈1800;
308×9≈2700;398×9≈3600;
99×8≈800;319×5≈1500.
估算.
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.