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1. 直接写出得数。
$0.68 + 0.6 =$ $5.2 + 4.8 =$ $1 - 0.09 =$
$2 ÷ 10 =$ $2 ÷ 100 =$ $20 ÷ 1000 =$
$3.6 + 5 =$ $0.75 - 0.25 =$ $0.035 + 0.35 =$
$4.15 + 0.35 =$ $8.02 + 0.8 =$ $1.6 + 0.9 =$
$2.6 + 2.9 =$ $13.2 + 3.7 =$ $12.2 + 4.7 =$
$2.5 + 6 =$ $2.5 + 6.3 =$ $0.13 + 0.8 =$
$0.68 + 0.6 =$ $5.2 + 4.8 =$ $1 - 0.09 =$
$2 ÷ 10 =$ $2 ÷ 100 =$ $20 ÷ 1000 =$
$3.6 + 5 =$ $0.75 - 0.25 =$ $0.035 + 0.35 =$
$4.15 + 0.35 =$ $8.02 + 0.8 =$ $1.6 + 0.9 =$
$2.6 + 2.9 =$ $13.2 + 3.7 =$ $12.2 + 4.7 =$
$2.5 + 6 =$ $2.5 + 6.3 =$ $0.13 + 0.8 =$
答案
0.68 + 0.6 = 1.28
5.2 + 4.8 = 10
1 - 0.09 = 0.91
2 ÷ 10 = 0.2
2 ÷ 100 = 0.02
20 ÷ 1000 = 0.02
3.6 + 5 = 8.6
0.75 - 0.25 = 0.5
0.035 + 0.35 = 0.385
4.15 + 0.35 = 4.5
8.02 + 0.8 = 8.82
1.6 + 0.9 = 2.5
2.6 + 2.9 = 5.5
13.2 + 3.7 = 16.9
12.2 + 4.7 = 16.9
2.5 + 6 = 8.5
2.5 + 6.3 = 8.8
0.13 + 0.8 = 0.93
5.2 + 4.8 = 10
1 - 0.09 = 0.91
2 ÷ 10 = 0.2
2 ÷ 100 = 0.02
20 ÷ 1000 = 0.02
3.6 + 5 = 8.6
0.75 - 0.25 = 0.5
0.035 + 0.35 = 0.385
4.15 + 0.35 = 4.5
8.02 + 0.8 = 8.82
1.6 + 0.9 = 2.5
2.6 + 2.9 = 5.5
13.2 + 3.7 = 16.9
12.2 + 4.7 = 16.9
2.5 + 6 = 8.5
2.5 + 6.3 = 8.8
0.13 + 0.8 = 0.93
2. 列竖式计算。
$7.54 + 2.86 =$ $14.3 - 7.56 =$ $64.7 + 36.8 =$
$37.9 + 2.63 =$ $25 - 4.73 =$ $10.1 - 3.82 =$
$7.54 + 2.86 =$ $14.3 - 7.56 =$ $64.7 + 36.8 =$
$37.9 + 2.63 =$ $25 - 4.73 =$ $10.1 - 3.82 =$
答案
7.54
+ 2.86
------
10.40
（或简化为10.4）
14.30
7.56
-------
6.74
64.7
+36.8
------
101.5
37.90
+ 2.63
-------
40.53
25.00
4.73
-------
20.27
10.10
3.82
-------
6.28
最终结果：
$7.54 + 2.86 = 10.4$
$14.3 - 7.56 = 6.74$
$64.7 + 36.8 = 101.5$
$37.9 + 2.63 = 40.53$
$25 - 4.73 = 20.27$
$10.1 - 3.82 = 6.28$
不对，应该把竖式和结果对应，或者每个竖式下面直接写结果。重新调整，更规范：
1. $7.54 + 2.86 = 10.4$
7.54
+ 2.86
------
10.40 → 10.4
2. $14.3 - 7.56 = 6.74$
14.30
7.56
-------
6.74
3. $64.7 + 36.8 = 101.5$
64.7
+36.8
------
101.5
4. $37.9 + 2.63 = 40.53$
37.90
+ 2.63
-------
40.53
5. $25 - 4.73 = 20.27$
25.00
4.73
-------
20.27
6. $10.1 - 3.82 = 6.28$
10.10
3.82
-------
6.28
这样更清晰，符合四年级的规范，每个竖式下面给出结果。现在按照这个格式输出，确保每个竖式正确，结果正确。＜/think_never_used_51bce0c785ca2f68081bfa7d91973934＞ 7.54
+ 2.86
------
10.40
$7.54 + 2.86 = 10.4$
14.30
7.56
-------
6.74
$14.3 - 7.56 = 6.74$
64.7
+36.8
------
101.5
$64.7 + 36.8 = 101.5$
37.90
+ 2.63
-------
40.53
$37.9 + 2.63 = 40.53$
25.00
4.73
-------
20.27
$25 - 4.73 = 20.27$
10.10
3.82
-------
6.28
$10.1 - 3.82 = 6.28$
+ 2.86
------
10.40
（或简化为10.4）
14.30
7.56
-------
6.74
64.7
+36.8
------
101.5
37.90
+ 2.63
-------
40.53
25.00
4.73
-------
20.27
10.10
3.82
-------
6.28
最终结果：
$7.54 + 2.86 = 10.4$
$14.3 - 7.56 = 6.74$
$64.7 + 36.8 = 101.5$
$37.9 + 2.63 = 40.53$
$25 - 4.73 = 20.27$
$10.1 - 3.82 = 6.28$
不对，应该把竖式和结果对应，或者每个竖式下面直接写结果。重新调整，更规范：
1. $7.54 + 2.86 = 10.4$
7.54
+ 2.86
------
10.40 → 10.4
2. $14.3 - 7.56 = 6.74$
14.30
7.56
-------
6.74
3. $64.7 + 36.8 = 101.5$
64.7
+36.8
------
101.5
4. $37.9 + 2.63 = 40.53$
37.90
+ 2.63
-------
40.53
5. $25 - 4.73 = 20.27$
25.00
4.73
-------
20.27
6. $10.1 - 3.82 = 6.28$
10.10
3.82
-------
6.28
这样更清晰，符合四年级的规范，每个竖式下面给出结果。现在按照这个格式输出，确保每个竖式正确，结果正确。＜/think_never_used_51bce0c785ca2f68081bfa7d91973934＞ 7.54
+ 2.86
------
10.40
$7.54 + 2.86 = 10.4$
14.30
7.56
-------
6.74
$14.3 - 7.56 = 6.74$
64.7
+36.8
------
101.5
$64.7 + 36.8 = 101.5$
37.90
+ 2.63
-------
40.53
$37.9 + 2.63 = 40.53$
25.00
4.73
-------
20.27
$25 - 4.73 = 20.27$
10.10
3.82
-------
6.28
$10.1 - 3.82 = 6.28$
3. 计算下列各题，能简算的要简算。
$8.67 + 2.85 - 0.67$ $4.6 + 28.25 + 5.4 + 2.75$
$109 - 11.3 - 3.4 - 4.3$ $8.19 - 5.9 + 12.91 - 4.1$
$8.67 + 2.85 - 0.67$ $4.6 + 28.25 + 5.4 + 2.75$
$109 - 11.3 - 3.4 - 4.3$ $8.19 - 5.9 + 12.91 - 4.1$
答案
$8.67 + 2.85 - 0.67$
$=8.67 - 0.67 + 2.85$
$=8 + 2.85$
$=10.85$
$4.6 + 28.25 + 5.4 + 2.75$
$=(4.6 + 5.4) + (28.25 + 2.75)$
$=10 + 31$
$=41$
$109 - 11.3 - 3.4 - 4.3$
$=109 - (11.3 + 4.3 + 3.4)$
$=109 - (15.6 + 3.4)$
$=109 - 19$
$=90$
$8.19 - 5.9 + 12.91 - 4.1$
$=(8.19 + 12.91) - (5.9 + 4.1)$
$=21.1 - 10$
$=11.1$
$=8.67 - 0.67 + 2.85$
$=8 + 2.85$
$=10.85$
$4.6 + 28.25 + 5.4 + 2.75$
$=(4.6 + 5.4) + (28.25 + 2.75)$
$=10 + 31$
$=41$
$109 - 11.3 - 3.4 - 4.3$
$=109 - (11.3 + 4.3 + 3.4)$
$=109 - (15.6 + 3.4)$
$=109 - 19$
$=90$
$8.19 - 5.9 + 12.91 - 4.1$
$=(8.19 + 12.91) - (5.9 + 4.1)$
$=21.1 - 10$
$=11.1$
