问题
解答题
|
答案
(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.
|
(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.