题目内容
估算. 32×48≈ |
43×22≈ | 41×19≈ | 32×51≈ |
分析:在乘法估算中,一般要把因数看作接近的整十、整百、整千…的数来进行计算;据此解答.
解答:解:(1)32×48,
≈30×50,
=1500;
(2)43×22,
≈40×20,
=800;
(3)41×19,
≈40×20,
=800;
(4)32×51,
≈30×50,
=1500.
≈30×50,
=1500;
(2)43×22,
≈40×20,
=800;
(3)41×19,
≈40×20,
=800;
(4)32×51,
≈30×50,
=1500.
点评:本题考查了学生对整数乘除法的估算掌握情况.
练习册系列答案
相关题目