一、口算。
25 + 85 =
540 ÷ 9 =
302 × 6 =
600 ÷ 12 =
82 - 27 =
132 - 44 =
55 ÷ 55 =
390 ÷ 13 =
4 × 51 =
600 - 290 =
350 ÷ 7 =
840 ÷ 40 =
145 - 95 =
20 × 70 =
78 + 67 =
60 × 90 =
450 ÷ 90 =
42 ÷ 14 =
20 + 800 =
120 × 7 =
510 ÷ 30 =
660 ÷ 30 =
910 ÷ 70 =
22 × 80 =

一、110 60 1812 50 55 88 1 30 204 310 50 21 50 1400 145 5400 5 3 820 840 17 22 13 1760

解：
25 + 85 = 110
540 ÷ 9 = 60
302 × 6 = 1812
600 ÷ 12 = 50
82 - 27 = 55
132 - 44 = 88
55 ÷ 55 = 1
390 ÷ 13 = 30
4 × 51 = 204
600 - 290 = 310
350 ÷ 7 = 50
840 ÷ 40 = 21
145 - 95 = 50
20 × 70 = 1400
78 + 67 = 145
60 × 90 = 5400
450 ÷ 90 = 5
42 ÷ 14 = 3
20 + 800 = 820
120 × 7 = 840
510 ÷ 30 = 17
660 ÷ 30 = 22
910 ÷ 70 = 13
22 × 80 = 1760

二、用竖式计算,带 * 的要验算。
97 ÷ 26
870 ÷ 29
* 444 ÷ 87
205 ÷ 21
567 ÷ 43
* 427 ÷ 41

二、3……19 30 5……9 9……16 13……8 10……17

444÷87=5······9


427÷41=10······17