口算．
| 25×4= |
20×300= |
2400÷40= |
3200+800= |
39万+12万= |
| 80万﹣27万= |
0÷99= |
40×70= |
690000﹣270000= |
450000+580000= |
怎样算简便就怎样算．
3280÷16+60018.75﹣6.2﹣3.8 3.75+4.5÷0.18×0.2525×1.25×32．
脱式计算（能简算的要简算）．
①0.125×0.25×8×4 ②6.6×12+8×6.6
③
×
+÷
④8.05﹣0.75﹣
．
脱式计算，能简算的要简算．
7.32﹣（3.8+1.32）95.6×18﹣
×8（1﹣
×
）÷
1.5÷〔1.2﹣（0.4+0.5）〕 0.125×2+6.6÷8﹣12.5%6.7×0.25+9.3÷4．
看谁算得准（能简算要简算）．
（
+
）×8+
41×9.9+4.1．
用简便方法计算
399×101 402×25+98×25 125×32×0.25 3.78+[6.5﹣（3.5+2）]．