综合套题九
1、口算（≈为估算）
98 ÷ 20 ≈	6.2 - 4.7 =	82 - 65 =
159 + 79 =	230 × 50 =	350 + 60 =
5600 ÷ 60 =	48 × 90 =	1100 ÷ 25 =
703 × 72 ≈	77 × 5 =	770 ÷ 60 =
2、竖式计算（带*要求验算）
545 ÷ 89 =	*480 ÷ 40 =	*507 × 31 =
1890 ÷ 82 =	482 ÷ 55 =	50 ×531 =
3、脱式计算
420 ÷ 14 ÷ 6	582 ÷ (103 - 97)	778 + 51 × 4