问题 解答题

估一估

89×7≈______;312×6≈______;

42×5≈______;297×6≈______;

99×8≈______;319×5≈______.

答案

89×7≈90×7=630;312×6≈310×6=1860;

42×5≈40×5=200; 297×6≈300×6=1800;

99×8≈100×8=800; 319×5≈320×5=1600.

故答案为:630,1860,200,1800,800,1600.

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