题目内容
| 先估一估,再算一算下面各题. 603+197= | 700-92= |
| 902-98= | 920-111= |
| 964-280= | 430+179= |
| 703-219= | 900-361= |
| 805-11= |
(1)603+197≈800,
603+197=800;
(2)700-92≈610,
700-92=608;
(3)902-98≈800,
902-98=804;
(4)920-111≈800,
920-111=809;
(5)964-280≈700,
964-280=684;
(6)430+179≈600,
430+179=609;
(7)703-219≈500,
703-219=484;
(8)900-361≈540,
900-361=539;
(9)805-11≈790,
805-11=794.
603+197=800;
(2)700-92≈610,
700-92=608;
(3)902-98≈800,
902-98=804;
(4)920-111≈800,
920-111=809;
(5)964-280≈700,
964-280=684;
(6)430+179≈600,
430+179=609;
(7)703-219≈500,
703-219=484;
(8)900-361≈540,
900-361=539;
(9)805-11≈790,
805-11=794.
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