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1. 直接写出得数。
97 + 13 =
6 × 25 =
120 - 80 =
560 ÷ 7 ÷ 2 =
87 - 29 =
84 + 34 =
357 ÷ 7 =
280 - 199 - 1 =
18 × 5 =
81 - 62 =
225 ÷ 15 =
57 - 43 + 36 =
540 ÷ 54 =
420 ÷ 21 =
70 × 80 =
45 × 5 ÷ 9 =
26 × 8 =
540 - 60 =
306 ÷ 9 =
99 × 99 + 99 =
490 ÷ 7 =
630 ÷ 30 =
700 × 13 =
276 - (45 + 76) =
85 × 20 =
440 ÷ 22 =
402 × 3 =
5 × 20 ÷ 5 × 20 =
906 ÷ 3 =
840 ÷ 6 =
291 ÷ 3 =
75 × 16 ÷ 75 =
97 + 13 =
110
6 × 25 =
150
120 - 80 =
40
560 ÷ 7 ÷ 2 =
40
87 - 29 =
58
84 + 34 =
118
357 ÷ 7 =
51
280 - 199 - 1 =
80
18 × 5 =
90
81 - 62 =
19
225 ÷ 15 =
15
57 - 43 + 36 =
50
540 ÷ 54 =
10
420 ÷ 21 =
20
70 × 80 =
5600
45 × 5 ÷ 9 =
25
26 × 8 =
208
540 - 60 =
480
306 ÷ 9 =
34
99 × 99 + 99 =
9900
490 ÷ 7 =
70
630 ÷ 30 =
21
700 × 13 =
9100
276 - (45 + 76) =
155
85 × 20 =
1700
440 ÷ 22 =
20
402 × 3 =
1206
5 × 20 ÷ 5 × 20 =
400
906 ÷ 3 =
302
840 ÷ 6 =
140
291 ÷ 3 =
97
75 × 16 ÷ 75 =
16
答案
110 150 40 40 58 118 51 80 90 19 15 50 10 20 5600 25 208 480 34 9900 70 21 9100 155 1700 20 1206 400 302 140 97 16
2. 计算下面各题,能简算的要简算。
125 × (80 - 8)
540 × 14 + 46 × 140
(36 + 108) × 12 ÷ 18
125 × (80 - 8)
540 × 14 + 46 × 140
(36 + 108) × 12 ÷ 18
答案
9000 14000 96
解析
125×(80-8)
=125×80-125×8
=10000-1000
=9000
540×14+46×140
=54×10×14+46×140
=54×140+46×140
=(54+46)×140
=100×140
=14000
(36+108)×12÷18
=144×12÷18
=1728÷18
=96
=125×80-125×8
=10000-1000
=9000
540×14+46×140
=54×10×14+46×140
=54×140+46×140
=(54+46)×140
=100×140
=14000
(36+108)×12÷18
=144×12÷18
=1728÷18
=96
3. 计算下面梯形的面积。
(1)
(2)
(1)
(2)
答案
（1）$(4+8)× 5÷ 2=30(\text{cm}^2)$
（2）$(4+6)× 7÷ 2=35(\text{dm}^2)$
（2）$(4+6)× 7÷ 2=35(\text{dm}^2)$
如图(单位：厘米),将两个完全相同的直角梯形的一部分重叠在一起,涂色部分的面积是多少平方厘米？
答案
$40-8=32(\text{厘米})$
$(32+40)× 16÷ 2=576(\text{平方厘米})$
$(32+40)× 16÷ 2=576(\text{平方厘米})$
