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一、口算。
28 + 77 =
920 ÷ 23 =
13 × 40 =
708 ÷ 4 =
8 × 104 =
72 - 54 =
200 - 138 =
880 ÷ 40 =
580 ÷ 20 =
60 × 21 =
95 × 100 =
157 + 53 =
3200 ÷ 20 =
3 × 205 =
247 + 120 =
305 × 4 =
82 - 28 =
575 ÷ 5 =
620 ÷ 31 =
357 + 468 =
900 × 70 =
1300 - 600 =
550 ÷ 11 =
80 × 25 =
28 + 77 =
105
920 ÷ 23 =
40
13 × 40 =
520
708 ÷ 4 =
177
8 × 104 =
832
72 - 54 =
18
200 - 138 =
62
880 ÷ 40 =
22
580 ÷ 20 =
29
60 × 21 =
1260
95 × 100 =
9500
157 + 53 =
210
3200 ÷ 20 =
160
3 × 205 =
615
247 + 120 =
367
305 × 4 =
1220
82 - 28 =
54
575 ÷ 5 =
115
620 ÷ 31 =
20
357 + 468 =
825
900 × 70 =
63000
1300 - 600 =
700
550 ÷ 11 =
50
80 × 25 =
2000
答案
一、105 40 520 177 832 18 62 22 29 1260 9500 210 160 615 367 1220 54 115 20 825 63000 700 50 2000
二、计算下面涂色部分的面积。
答案
二、$(6+12)×6÷2=$54（$\mathrm{d}{\mathrm{m}}^{\mathrm{2}}$）$6×3÷2=9$（$\mathrm{m}{}^{\mathrm{2}}$）
