第一单元专项练习08:小数的加法和减法基础计算(口算)-2024-2025学年四年级数学下册典型例题系列(原卷版+解析版)北师大版
2025-04-16
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4份
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16页
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资源信息
| 学段 | 小学 |
| 学科 | 数学 |
| 教材版本 | 小学数学北师大版(2012)四年级下册 |
| 年级 | 四年级 |
| 章节 | 一 小数的意义和加减法 |
| 类型 | 题集-专项训练 |
| 知识点 | - |
| 使用场景 | 同步教学-单元练习 |
| 学年 | 2025-2026 |
| 地区(省份) | 全国 |
| 地区(市) | - |
| 地区(区县) | - |
| 文件格式 | ZIP |
| 文件大小 | 430 KB |
| 发布时间 | 2025-04-16 |
| 更新时间 | 2025-04-16 |
| 作者 | 101数学创作社 |
| 品牌系列 | 学科专项·典例易错变式 |
| 审核时间 | 2025-04-16 |
| 下载链接 | https://m.zxxk.com/soft/51637981.html |
| 价格 | 3.00储值(1储值=1元) |
| 来源 | 学科网 |
|---|
内容正文:
第 1 页 共 5 页
2024-2025 学年四年级数学下册典型例题系列「2025 版」
第一单元专项练习 08:小数的加法和减法基础计算(口算)
第一组
0.6 + 0.3 = 1.5 - 0.7 = 3.4 + 2.1 = 7.8 - 4.5 =
0.9 + 0.2 = 4.7 - 1.8 = 2.3 + 5.6 = 9.1 - 2.4 =
第二组
1.2 + 0.8 = 6.7 - 3.2 = 0.45 + 0.55 = 8.9 - 6.3 =
2.5 + 1.5 = 4.6 - 0.9 = 3.75 + 1.25 = 10 - 3.7 =
第三组
7.4 - 2.8 = 0.63 + 0.27 = 9.6 - 0.48 = 5.77 + 1.23 =
3.9 + 2.1 = 8.5 - 4.7 = 1.28 + 0.72 = 6.3 - 1.5 =
第四组
3.45 + 8.7 = 16.55 + 1.3 = 8.54 + 5.96 = 27.38 - 5.34 =
2.62 + 4.66 = 8.5 + 9.63 = 4.76 - 1.12 = 1.45 + 2.7 =
第五组
9.46 + 1.28 = 18.55 - 5.34 = 10 - 0.385 = 7.03 + 2.95 =
6.24 - 3.09 = 4.8 + 15.7 = 9.07 - 4.5 = 3.2 + 0.68 =
第六组
0.7 + 0.9 = 8.4 - 6.3 = 14.6 - 0.34 = 1.3 + 8.56 =
0.8 - 0.55 = 4 - 0.04 = 30.5 + 3.05 = 0.78 + 2.2 =
第七组
5.85 - 1.75 = 24.8 + 14.6 = 3.8 + 1.37 = 42.5 - 22.17 =
7.68 - 6.5 = 3.83 + 9.45 = 6.01 + 5.39 = 8.25 - 4.64 =
第八组
第 2 页 共 5 页
5.82 - 4.73 = 8.78 - 0.52 = 4.15 + 7.08 = 2.59 + 9.10 =
3.51 + 9.0 = 4.54 + 2.55 = 1.31 + 5.61 = 7.21 - 0.77 =
第九组
8.64 - 7.85 = 8.68 + 0.84 = 5.93 - 1.20 = 3.66 + 5.90 =
6.14 - 2.01 = 5.58 + 0.13 = 5.15 - 4.79 = 5.29 + 6.33 =
第十组
5.86 - 1.95 = 3.79 - 3.47 = 8.89 - 0.20 = 7.42 + 9.92 =
4.47 + 9.24 = 8.53 + 3.94 = 6.35 - 2.83 = 4.36 + 7.50 =
第十一组
3.28 + 1.45 = 15.67 - 8.39 = 0.99 + 2.01 = 7.34 - 2.18 =
4.56 + 3.27 = 9.83 - 4.75 = 12.05 + 5.95 = 20 - 6.44 =
第十二组
8.12 + 7.88 = 13.5 - 9.27 = 25.04 + 4.96 = 7.63 - 1.89 =
0.78 + 0.92 = 6.45 - 3.18 = 9.01 + 1.99 = 15 - 8.73 =
第十三组
3.34 + 4.51 = 6.29 + 0.67 = 9.60 + 0.73 = 2.23 + 5.50 =
9.81 - 0.09 = 2.80 + 6.46 = 7.74 + 1.48 = 4.22 - 2.66 =
第十四组
8.28 + 7.36 = 7.48 - 6.52 = 4.64 - 3.25 = 5.62 + 2.82 =
6.63 + 7.16 = 5.94 - 0.36 = 8.80 + 7.97 = 7.87 + 9.72 =
第十五组
8.76 + 0.75 = 7.37 - 4.92 = 7.52 - 1.82 = 2.53 + 4.77 =
8.23 - 2.35 = 4.45 + 6.35 = 1.00 + 4.02 = 5.20 - 1.50 =
第十六组
12.7 - 8.4 = 17.3 + 12.8 = 10.9 - 10.9 = 19.8 + 10.7 =
8.4 - 6.3 = 10.7 - 10.7 = 19.8 + 10.8 = 9.8 - 9.8 =
第 3 页 共 5 页
第十七组
16.8 - 16.8 = 19.9 + 3.1 = 16.7 - 16.7 = 16.9 - 10.8 =
13.7 - 4.6 = 4.6 - 4.6 = 18.1 - 4.7 = 2.1 + 13.7 =
第十八组
20.6 - 15 = 18.3 + 7.9 = 6 + 20.6 = 16.6 + 4.7 =
2.2 + 13.8 = 7.5 + 4.7 = 7.6 + 4.7 = 15 + 7.5 =
第十九组
12.1 - 7.5 = 20.7 - 9.1 = 3 + 7.6 = 4.5 + 10.6 =
7.4 + 17.5 = 5.1 + 13.8 = 17.5 + 17.5 = 17.3 - 7.4 =
第二十组
17.7 + 10.8 = 4.4 + 4.4 = 14.3 - 4.4 = 4.3 + 4.3 =
2.9 + 20.6 = 11.3 + 11.3 = 9 + 7.7 = 20.3 - 11.4 =
第 4 页 共 5 页
参考答案
第一组
0.90|0.80|5.50|3.30|1.10|2.90|7.90|6.70
第二组
2.00|3.50|1.00|2.60|4.00|3.70|5.00|6.30
第三组
4.60|0.90|9.12|7.00|6.00|3.80|2.00|4.80
第四组
12.15|17.85|14.50|22.04|7.28|18.13|3.64|4.15
第五组
10.74|13.21|9.62|9.98|3.15|20.50|4.57|3.88
第六组
1.60|2.10|14.26|9.86|0.25|3.96|33.55|2.98
第七组
4.10|39.40|5.17|20.33|1.18|13.28|11.40|3.61
第八组
1.09|8.26|11.23|11.69|12.51|7.09|6.92|6.44
第九组
0.79|9.52|4.73|9.56|4.13|5.71|0.36|11.62
第十组
3.91|0.32|8.69|17.34|13.71|11.88|3.52|11.86
第十一组
4.73|7.28|3.00|5.16|7.83|5.08|18.00|13.56
第十二组
第 5 页 共 5 页
16.00|4.23|30.00|5.74|1.70|3.27|11.00|6.27
第十三组
7.85|6.96|10.33|7.73|9.72|9.26|9.22|1.56
第十四组
15.64|0.96|1.39|8.44|13.79|5.58|16.77|17.59
第十五组
9.51|2.45|5.70|7.30|5.88|10.80|5.02|3.70
第十六组
4.30|30.10|0.00|30.50|2.10|0.00|30.60|0.00
第十七组
0.00|23.00|0.00|6.10|9.10|0.00|13.40|15.80
第十八组
5.60|26.20|26.60|21.30|16.00|12.30|12.30|22.50
第十九组
4.60|11.60|10.60|15.10|24.90|18.90|35.00|9.90
第二十组
28.50|8.80|9.90|8.60|23.50|22.60|16.70|8.90
2024-2025学年四年级数学下册典型例题系列「2025版」
第一单元专项练习08:小数的加法和减法基础计算(口算)
第一组
0.6 + 0.3 = 1.5 - 0.7 = 3.4 + 2.1 = 7.8 - 4.5 =
0.9 + 0.2 = 4.7 - 1.8 = 2.3 + 5.6 = 9.1 - 2.4 =
第二组
1.2 + 0.8 = 6.7 - 3.2 = 0.45 + 0.55 = 8.9 - 6.3 =
2.5 + 1.5 = 4.6 - 0.9 = 3.75 + 1.25 = 10 - 3.7 =
第三组
7.4 - 2.8 = 0.63 + 0.27 = 9.6 - 0.48 = 5.77 + 1.23 =
3.9 + 2.1 = 8.5 - 4.7 = 1.28 + 0.72 = 6.3 - 1.5 =
第四组
3.45 + 8.7 = 16.55 + 1.3 = 8.54 + 5.96 = 27.38 - 5.34 =
2.62 + 4.66 = 8.5 + 9.63 = 4.76 - 1.12 = 1.45 + 2.7 =
第五组
9.46 + 1.28 = 18.55 - 5.34 = 10 - 0.385 = 7.03 + 2.95 =
6.24 - 3.09 = 4.8 + 15.7 = 9.07 - 4.5 = 3.2 + 0.68 =
第六组
0.7 + 0.9 = 8.4 - 6.3 = 14.6 - 0.34 = 1.3 + 8.56 =
0.8 - 0.55 = 4 - 0.04 = 30.5 + 3.05 = 0.78 + 2.2 =
第七组
5.85 - 1.75 = 24.8 + 14.6 = 3.8 + 1.37 = 42.5 - 22.17 =
7.68 - 6.5 = 3.83 + 9.45 = 6.01 + 5.39 = 8.25 - 4.64 =
第八组
5.82 - 4.73 = 8.78 - 0.52 = 4.15 + 7.08 = 2.59 + 9.10 =
3.51 + 9.0 = 4.54 + 2.55 = 1.31 + 5.61 = 7.21 - 0.77 =
第九组
8.64 - 7.85 = 8.68 + 0.84 = 5.93 - 1.20 = 3.66 + 5.90 =
6.14 - 2.01 = 5.58 + 0.13 = 5.15 - 4.79 = 5.29 + 6.33 =
第十组
5.86 - 1.95 = 3.79 - 3.47 = 8.89 - 0.20 = 7.42 + 9.92 =
4.47 + 9.24 = 8.53 + 3.94 = 6.35 - 2.83 = 4.36 + 7.50 =
第十一组
3.28 + 1.45 = 15.67 - 8.39 = 0.99 + 2.01 = 7.34 - 2.18 =
4.56 + 3.27 = 9.83 - 4.75 = 12.05 + 5.95 = 20 - 6.44 =
第十二组
8.12 + 7.88 = 13.5 - 9.27 = 25.04 + 4.96 = 7.63 - 1.89 =
0.78 + 0.92 = 6.45 - 3.18 = 9.01 + 1.99 = 15 - 8.73 =
第十三组
3.34 + 4.51 = 6.29 + 0.67 = 9.60 + 0.73 = 2.23 + 5.50 =
9.81 - 0.09 = 2.80 + 6.46 = 7.74 + 1.48 = 4.22 - 2.66 =
第十四组
8.28 + 7.36 = 7.48 - 6.52 = 4.64 - 3.25 = 5.62 + 2.82 =
6.63 + 7.16 = 5.94 - 0.36 = 8.80 + 7.97 = 7.87 + 9.72 =
第十五组
8.76 + 0.75 = 7.37 - 4.92 = 7.52 - 1.82 = 2.53 + 4.77 =
8.23 - 2.35 = 4.45 + 6.35 = 1.00 + 4.02 = 5.20 - 1.50 =
第十六组
12.7 - 8.4 = 17.3 + 12.8 = 10.9 - 10.9 = 19.8 + 10.7 =
8.4 - 6.3 = 10.7 - 10.7 = 19.8 + 10.8 = 9.8 - 9.8 =
第十七组
16.8 - 16.8 = 19.9 + 3.1 = 16.7 - 16.7 = 16.9 - 10.8 =
13.7 - 4.6 = 4.6 - 4.6 = 18.1 - 4.7 = 2.1 + 13.7 =
第十八组
20.6 - 15 = 18.3 + 7.9 = 6 + 20.6 = 16.6 + 4.7 =
2.2 + 13.8 = 7.5 + 4.7 = 7.6 + 4.7 = 15 + 7.5 =
第十九组
12.1 - 7.5 = 20.7 - 9.1 = 3 + 7.6 = 4.5 + 10.6 =
7.4 + 17.5 = 5.1 + 13.8 = 17.5 + 17.5 = 17.3 - 7.4 =
第二十组
17.7 + 10.8 = 4.4 + 4.4 = 14.3 - 4.4 = 4.3 + 4.3 =
2.9 + 20.6 = 11.3 + 11.3 = 9 + 7.7 = 20.3 - 11.4 =
第 1 页 共 1 页
学科网(北京)股份有限公司
$$
2024-2025学年四年级数学下册典型例题系列「2025版」
第一单元专项练习08:小数的加法和减法基础计算(口算)
第一组
0.6 + 0.3 = 1.5 - 0.7 = 3.4 + 2.1 = 7.8 - 4.5 =
0.9 + 0.2 = 4.7 - 1.8 = 2.3 + 5.6 = 9.1 - 2.4 =
第二组
1.2 + 0.8 = 6.7 - 3.2 = 0.45 + 0.55 = 8.9 - 6.3 =
2.5 + 1.5 = 4.6 - 0.9 = 3.75 + 1.25 = 10 - 3.7 =
第三组
7.4 - 2.8 = 0.63 + 0.27 = 9.6 - 0.48 = 5.77 + 1.23 =
3.9 + 2.1 = 8.5 - 4.7 = 1.28 + 0.72 = 6.3 - 1.5 =
第四组
3.45 + 8.7 = 16.55 + 1.3 = 8.54 + 5.96 = 27.38 - 5.34 =
2.62 + 4.66 = 8.5 + 9.63 = 4.76 - 1.12 = 1.45 + 2.7 =
第五组
9.46 + 1.28 = 18.55 - 5.34 = 10 - 0.385 = 7.03 + 2.95 =
6.24 - 3.09 = 4.8 + 15.7 = 9.07 - 4.5 = 3.2 + 0.68 =
第六组
0.7 + 0.9 = 8.4 - 6.3 = 14.6 - 0.34 = 1.3 + 8.56 =
0.8 - 0.55 = 4 - 0.04 = 30.5 + 3.05 = 0.78 + 2.2 =
第七组
5.85 - 1.75 = 24.8 + 14.6 = 3.8 + 1.37 = 42.5 - 22.17 =
7.68 - 6.5 = 3.83 + 9.45 = 6.01 + 5.39 = 8.25 - 4.64 =
第八组
5.82 - 4.73 = 8.78 - 0.52 = 4.15 + 7.08 = 2.59 + 9.10 =
3.51 + 9.0 = 4.54 + 2.55 = 1.31 + 5.61 = 7.21 - 0.77 =
第九组
8.64 - 7.85 = 8.68 + 0.84 = 5.93 - 1.20 = 3.66 + 5.90 =
6.14 - 2.01 = 5.58 + 0.13 = 5.15 - 4.79 = 5.29 + 6.33 =
第十组
5.86 - 1.95 = 3.79 - 3.47 = 8.89 - 0.20 = 7.42 + 9.92 =
4.47 + 9.24 = 8.53 + 3.94 = 6.35 - 2.83 = 4.36 + 7.50 =
第十一组
3.28 + 1.45 = 15.67 - 8.39 = 0.99 + 2.01 = 7.34 - 2.18 =
4.56 + 3.27 = 9.83 - 4.75 = 12.05 + 5.95 = 20 - 6.44 =
第十二组
8.12 + 7.88 = 13.5 - 9.27 = 25.04 + 4.96 = 7.63 - 1.89 =
0.78 + 0.92 = 6.45 - 3.18 = 9.01 + 1.99 = 15 - 8.73 =
第十三组
3.34 + 4.51 = 6.29 + 0.67 = 9.60 + 0.73 = 2.23 + 5.50 =
9.81 - 0.09 = 2.80 + 6.46 = 7.74 + 1.48 = 4.22 - 2.66 =
第十四组
8.28 + 7.36 = 7.48 - 6.52 = 4.64 - 3.25 = 5.62 + 2.82 =
6.63 + 7.16 = 5.94 - 0.36 = 8.80 + 7.97 = 7.87 + 9.72 =
第十五组
8.76 + 0.75 = 7.37 - 4.92 = 7.52 - 1.82 = 2.53 + 4.77 =
8.23 - 2.35 = 4.45 + 6.35 = 1.00 + 4.02 = 5.20 - 1.50 =
第十六组
12.7 - 8.4 = 17.3 + 12.8 = 10.9 - 10.9 = 19.8 + 10.7 =
8.4 - 6.3 = 10.7 - 10.7 = 19.8 + 10.8 = 9.8 - 9.8 =
第十七组
16.8 - 16.8 = 19.9 + 3.1 = 16.7 - 16.7 = 16.9 - 10.8 =
13.7 - 4.6 = 4.6 - 4.6 = 18.1 - 4.7 = 2.1 + 13.7 =
第十八组
20.6 - 15 = 18.3 + 7.9 = 6 + 20.6 = 16.6 + 4.7 =
2.2 + 13.8 = 7.5 + 4.7 = 7.6 + 4.7 = 15 + 7.5 =
第十九组
12.1 - 7.5 = 20.7 - 9.1 = 3 + 7.6 = 4.5 + 10.6 =
7.4 + 17.5 = 5.1 + 13.8 = 17.5 + 17.5 = 17.3 - 7.4 =
第二十组
17.7 + 10.8 = 4.4 + 4.4 = 14.3 - 4.4 = 4.3 + 4.3 =
2.9 + 20.6 = 11.3 + 11.3 = 9 + 7.7 = 20.3 - 11.4 =
参考答案
第一组
0.90|0.80|5.50|3.30|1.10|2.90|7.90|6.70
第二组
2.00|3.50|1.00|2.60|4.00|3.70|5.00|6.30
第三组
4.60|0.90|9.12|7.00|6.00|3.80|2.00|4.80
第四组
12.15|17.85|14.50|22.04|7.28|18.13|3.64|4.15
第五组
10.74|13.21|9.62|9.98|3.15|20.50|4.57|3.88
第六组
1.60|2.10|14.26|9.86|0.25|3.96|33.55|2.98
第七组
4.10|39.40|5.17|20.33|1.18|13.28|11.40|3.61
第八组
1.09|8.26|11.23|11.69|12.51|7.09|6.92|6.44
第九组
0.79|9.52|4.73|9.56|4.13|5.71|0.36|11.62
第十组
3.91|0.32|8.69|17.34|13.71|11.88|3.52|11.86
第十一组
4.73|7.28|3.00|5.16|7.83|5.08|18.00|13.56
第十二组
16.00|4.23|30.00|5.74|1.70|3.27|11.00|6.27
第十三组
7.85|6.96|10.33|7.73|9.72|9.26|9.22|1.56
第十四组
15.64|0.96|1.39|8.44|13.79|5.58|16.77|17.59
第十五组
9.51|2.45|5.70|7.30|5.88|10.80|5.02|3.70
第十六组
4.30|30.10|0.00|30.50|2.10|0.00|30.60|0.00
第十七组
0.00|23.00|0.00|6.10|9.10|0.00|13.40|15.80
第十八组
5.60|26.20|26.60|21.30|16.00|12.30|12.30|22.50
第十九组
4.60|11.60|10.60|15.10|24.90|18.90|35.00|9.90
第二十组
28.50|8.80|9.90|8.60|23.50|22.60|16.70|8.90
第 1 页 共 1 页
学科网(北京)股份有限公司
$$第 1 页 共 3 页
2024-2025 学年四年级数学下册典型例题系列「2025 版」
第一单元专项练习 08:小数的加法和减法基础计算(口算)
第一组
0.6 + 0.3 = 1.5 - 0.7 = 3.4 + 2.1 = 7.8 - 4.5 =
0.9 + 0.2 = 4.7 - 1.8 = 2.3 + 5.6 = 9.1 - 2.4 =
第二组
1.2 + 0.8 = 6.7 - 3.2 = 0.45 + 0.55 = 8.9 - 6.3 =
2.5 + 1.5 = 4.6 - 0.9 = 3.75 + 1.25 = 10 - 3.7 =
第三组
7.4 - 2.8 = 0.63 + 0.27 = 9.6 - 0.48 = 5.77 + 1.23 =
3.9 + 2.1 = 8.5 - 4.7 = 1.28 + 0.72 = 6.3 - 1.5 =
第四组
3.45 + 8.7 = 16.55 + 1.3 = 8.54 + 5.96 = 27.38 - 5.34 =
2.62 + 4.66 = 8.5 + 9.63 = 4.76 - 1.12 = 1.45 + 2.7 =
第五组
9.46 + 1.28 = 18.55 - 5.34 = 10 - 0.385 = 7.03 + 2.95 =
6.24 - 3.09 = 4.8 + 15.7 = 9.07 - 4.5 = 3.2 + 0.68 =
第六组
0.7 + 0.9 = 8.4 - 6.3 = 14.6 - 0.34 = 1.3 + 8.56 =
0.8 - 0.55 = 4 - 0.04 = 30.5 + 3.05 = 0.78 + 2.2 =
第七组
5.85 - 1.75 = 24.8 + 14.6 = 3.8 + 1.37 = 42.5 - 22.17 =
7.68 - 6.5 = 3.83 + 9.45 = 6.01 + 5.39 = 8.25 - 4.64 =
第八组
第 2 页 共 3 页
5.82 - 4.73 = 8.78 - 0.52 = 4.15 + 7.08 = 2.59 + 9.10 =
3.51 + 9.0 = 4.54 + 2.55 = 1.31 + 5.61 = 7.21 - 0.77 =
第九组
8.64 - 7.85 = 8.68 + 0.84 = 5.93 - 1.20 = 3.66 + 5.90 =
6.14 - 2.01 = 5.58 + 0.13 = 5.15 - 4.79 = 5.29 + 6.33 =
第十组
5.86 - 1.95 = 3.79 - 3.47 = 8.89 - 0.20 = 7.42 + 9.92 =
4.47 + 9.24 = 8.53 + 3.94 = 6.35 - 2.83 = 4.36 + 7.50 =
第十一组
3.28 + 1.45 = 15.67 - 8.39 = 0.99 + 2.01 = 7.34 - 2.18 =
4.56 + 3.27 = 9.83 - 4.75 = 12.05 + 5.95 = 20 - 6.44 =
第十二组
8.12 + 7.88 = 13.5 - 9.27 = 25.04 + 4.96 = 7.63 - 1.89 =
0.78 + 0.92 = 6.45 - 3.18 = 9.01 + 1.99 = 15 - 8.73 =
第十三组
3.34 + 4.51 = 6.29 + 0.67 = 9.60 + 0.73 = 2.23 + 5.50 =
9.81 - 0.09 = 2.80 + 6.46 = 7.74 + 1.48 = 4.22 - 2.66 =
第十四组
8.28 + 7.36 = 7.48 - 6.52 = 4.64 - 3.25 = 5.62 + 2.82 =
6.63 + 7.16 = 5.94 - 0.36 = 8.80 + 7.97 = 7.87 + 9.72 =
第十五组
8.76 + 0.75 = 7.37 - 4.92 = 7.52 - 1.82 = 2.53 + 4.77 =
8.23 - 2.35 = 4.45 + 6.35 = 1.00 + 4.02 = 5.20 - 1.50 =
第十六组
12.7 - 8.4 = 17.3 + 12.8 = 10.9 - 10.9 = 19.8 + 10.7 =
8.4 - 6.3 = 10.7 - 10.7 = 19.8 + 10.8 = 9.8 - 9.8 =
第 3 页 共 3 页
第十七组
16.8 - 16.8 = 19.9 + 3.1 = 16.7 - 16.7 = 16.9 - 10.8 =
13.7 - 4.6 = 4.6 - 4.6 = 18.1 - 4.7 = 2.1 + 13.7 =
第十八组
20.6 - 15 = 18.3 + 7.9 = 6 + 20.6 = 16.6 + 4.7 =
2.2 + 13.8 = 7.5 + 4.7 = 7.6 + 4.7 = 15 + 7.5 =
第十九组
12.1 - 7.5 = 20.7 - 9.1 = 3 + 7.6 = 4.5 + 10.6 =
7.4 + 17.5 = 5.1 + 13.8 = 17.5 + 17.5 = 17.3 - 7.4 =
第二十组
17.7 + 10.8 = 4.4 + 4.4 = 14.3 - 4.4 = 4.3 + 4.3 =
2.9 + 20.6 = 11.3 + 11.3 = 9 + 7.7 = 20.3 - 11.4 =
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