题目内容
口算
(1)70×80=
(2)3.8+2.5+6.2=
(3)
+
--
=
1.4×5=
(4)3.14×3=
+
=
(5)3.99+5.2=
(6)22×0.2=
(7)0.8×0.8=
(8)340÷17=
(9)1.5×4=
(10)0.28×100=
(11)340+120=
+
=
2.5÷5=
(12)12-
-
=
(13)3.08÷0.1=
(14)4.3-2.7=
(15)2.6÷26=
(1)70×80=
5600
5600
3.7×0.5=1.85
1.85
3.2×100=320
320
8.9-3.8=5.1
5.1
(2)3.8+2.5+6.2=
12.5
12.5
12-6.2-3.8=2
2
1.7+0.43+3.3=5.43
5.43
3.4-1.5-0.5=1.4
1.4
(3)
8 |
9 |
1 |
9 |
2 |
7 |
5 |
7 |
5 |
7 |
7
7
650-470=180
180
79+2.1=81.1
81.1
(4)3.14×3=
9.42
9.42
6.7+3.4=10.1
10.1
2.01×0.4=0.804
0.804
6 |
13 |
7 |
13 |
1
1
(5)3.99+5.2=
9.19
9.19
23+6.68=29.68
29.68
7×0.08=0.56
0.56
0.25×0.4=0.1
0.1
(6)22×0.2=
4.4
4.4
99.9+1=100.9
100.9
0.72÷6=0.12
0.12
3.9÷1.3=3
3
(7)0.8×0.8=
0.64
0.64
5.88+3.12=9
9
1.9+2.1=4
4
26÷2.6=10
10
(8)340÷17=
20
20
9.3÷0.3=31
31
13×4=52
52
3.6×5=18
18
(9)1.5×4=
6
6
20×16=320
320
28×3=84
84
3.2÷4=0.8
0.8
(10)0.28×100=
28
28
3200÷1000=3.2
3.2
0.5×100=50
50
4×0.125=0.5
0.5
(11)340+120=
460
460
1 |
4 |
1 |
2 |
3 |
4 |
3 |
4 |
0.5
0.5
4.95×10=49.5
49.5
(12)12-
1 |
2 |
1 |
2 |
11
11
1÷0.25=4
4
5×0.13=0.65
0.65
12×0.05=0.6
0.6
(13)3.08÷0.1=
30.8
30.8
0.35×6=2.1
2.1
25÷0.5=50
50
1.5×3=4.5
4.5
(14)4.3-2.7=
1.6
1.6
8.1÷0.9=9
9
12÷1.2=10
10
0.48÷6=0.08
0.08
(15)2.6÷26=
0.1
0.1
0.72×5=3.6
3.6
4.8+3.2=8
8
5.7÷0.3=19
19
.分析:运用整数、小数、分数四则计算的计算法则直接计算即可.
解答:解:(1)70×80=5600 3.7×0.5=1.85 3.2×100=320 8.9-3.8=5.1
(2)3.8+2.5+6.2=12.5 12-6.2-3.8=2 1.7+0.43+3.3=5.43 3.4-1.5-0.5=1.4
(3)
+
-
=
1.4×5=7 650-470=180 79+2.1=81.1
(4)3.14×3=9.42 6.7+3.4=10.1 2.01×0.4=0.804
+
=1
(5)3.99+5.2=9.19 23+6.68=29.68 7×0.08=0.56 0.25×0.4=0.1
(6)22×0.2=4.4 99.9+1=100.9 0.72÷6=0.12 3.9÷1.3=3
(7)0.8×0.8=0.64 5.88+3.12=9 1.9+2.1=4 26÷2.6=10
(8)340÷17=20 9.3÷0.3=31 13×4=52 3.6×5=18
(9)1.5×4=6 20×16=320 28×3=84 3.2÷4=0.8
(10)0.28×100=28 3200÷1000=3.2 0.5×100=50 4×0.125=0.5
(11)340+120=460
+
=
2.5÷5=0.5 4.95×10=49.5
(12)12-
-
=11 1÷0.25=4 5×0.13=0.65 12×0.05=0.6
(13)3.08÷0.1=30.8 0.35×6=2.1 25÷0.5=50 1.5×3=4.5
(14)4.3-2.7=1.6 8.1÷0.9=9 12÷1.2=10 0.48÷6=0.08
(15)2.6÷26=0.1 0.72×5=3.6 4.8+3.2=8 5.7÷0.3=19.
(2)3.8+2.5+6.2=12.5 12-6.2-3.8=2 1.7+0.43+3.3=5.43 3.4-1.5-0.5=1.4
(3)
8 |
9 |
1 |
9 |
2 |
7 |
5 |
7 |
(4)3.14×3=9.42 6.7+3.4=10.1 2.01×0.4=0.804
6 |
13 |
7 |
13 |
(5)3.99+5.2=9.19 23+6.68=29.68 7×0.08=0.56 0.25×0.4=0.1
(6)22×0.2=4.4 99.9+1=100.9 0.72÷6=0.12 3.9÷1.3=3
(7)0.8×0.8=0.64 5.88+3.12=9 1.9+2.1=4 26÷2.6=10
(8)340÷17=20 9.3÷0.3=31 13×4=52 3.6×5=18
(9)1.5×4=6 20×16=320 28×3=84 3.2÷4=0.8
(10)0.28×100=28 3200÷1000=3.2 0.5×100=50 4×0.125=0.5
(11)340+120=460
1 |
4 |
1 |
2 |
3 |
4 |
(12)12-
1 |
2 |
1 |
2 |
(13)3.08÷0.1=30.8 0.35×6=2.1 25÷0.5=50 1.5×3=4.5
(14)4.3-2.7=1.6 8.1÷0.9=9 12÷1.2=10 0.48÷6=0.08
(15)2.6÷26=0.1 0.72×5=3.6 4.8+3.2=8 5.7÷0.3=19.
点评:此题考查学生的计算能力,计算时要细心.
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口算:
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4.8÷0.01= | 5×÷5×= | 90×80%= | 1-1÷8= | (+)×12= |