一、口算。
74 + 16 =
90 ÷ 6 =
8 × 25 =
74 ÷ 2 =
45 × 4 =
100 - 76 =
500 × 5 =
639 ÷ 3 =
27 × 20 =
360 ÷ 9 =
212 × 3 =
230 - 80 =
160 × 5 =
30 × 18 =
408 ÷ 8 =
480 + 250 =
280 ÷ 2 =
302 × 6 =
40 × 17 =
210 × 2 =
580 ÷ 2 =
654 ÷ 6 =
59 × 20 =
24 × 30 =

一、90 15 200
37 180 24
2500 213 540
40 636 150
800 540 51
730 140 1812
680 420 290
109 1180 720

二、用竖式计算，带 * 的要验算。
38 × 42
14 × 53
*94. × 16
26 × 90
74 × 25
*56. × 37

二、1596 742 1504
2340 1850 2072