试题:
估算.
703×21≈
299×32≈473×99≈
298×7≈699×9≈372×19≈

答案:

我来补答
(1)703×21,
≈700×20,
=14000;

(2)299×32,
≈300×30,
=9000;

(3)473×99,
≈470×100,
=4700;

(4)298×7,
≈300×7,
=2100;

(5)699×9,
≈700×9,
=6300;

(6)372×19,
≈380×20,
=7600.
 
 
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剩余:2000
这些题目你会做吗?