1. 直接写出得数。
330 - 30 =
440 - 280 =
10 × 5 =
100 - 47 - 32 =
3 × 22 =
180 + 260 =
12 × 4 =
368 - (42 + 26) =
5 × 9 =
12 ÷ 6 =
340 + 280 =
63 ÷ 7 ÷ 9 =
48 + 36 =
3 × 8 =
600 - 190 =
2 × 5 × 3 =
73 - 17 =
44 × 2 =
28 ÷ 2 =
58 - 15 + 25 =
28 ÷ 7 =
4 × 21 =
64 ÷ 8 =
56 ÷ (2 × 4) =
2 × 42 =
68 + 34 =
31 × 1 =
81 - 81 ÷ 9 =
7 × 10 =
110 - 73 =
14 × 0 =
15 + 6 × 3 =

1. 300 160 50 21
66 440 48 300
45 2 620 1
84 24 410 30
56 88 14 68
4 84 8 7
84 102 31 72
70 37 0 33

2. 计算下面各题。
$70÷(271-264)$
$948+5×7$
$(349-339)×8$
$63÷7×9$
$9×(154-143)$
$(289-209)÷4$

2. 10 983 80
81 99 20

如图，拼成①号图形需要4根小棒，拼成②号图形需要7根小棒……如果继续拼下去，拼成③0号图形需要()根小棒，100根小棒拼成的是()号图形。

91 33