一、口算。
$14×7=$
$92+18=$
$83×4=$
$120-40=$
$109×6=$
$200+800=$
$600×2=$
$520+40=$
$113×3=$
$42×2=$
$150-60=$
$320×3=$
$86-68=$
$560-270=$
$720+35=$
$121×4=$
$58+37=$
$1000-300=$
$3×700=$
$274+302=$
$975-135=$
$28×4=$
$120×5=$
$102×7=$

1.98
2.110
3.332
4.80
5.654
6.1000
7.1200
8.560
9.339
10.84
11.90
12.960
13.18
14.290
15.755
16.484
17.95
18.700
19.2100
20.576
21.840
22.112
23.600
24.714

二、计算下面各题。
$(520 - 443) ÷ 7$
$36 ÷ 9 × 230$
$388 + (744 - 558)$
$218 × 4 - 300$
$375 × 2 × 6$
$1000 - 126 × 4$

1.11
2.920
3.574
4.572
5.4500
6.496