Lời giải Bài tập Toán lớp 5 Phép cộng số thập phân có đáp án

Câu 1

Hướng dẫn chấm do TopStudy biên soạn, mang tính gợi ý

$\begin{array}{l}\underline { + \begin{array}{cccccccccccccccccccc}{\,\,\,\,\,\,7{,}275}\\{6{,}3}\end{array}} \\\,\,\,\,\,\,\,\,13{,}575\end{array}$	$\begin{array}{l}\underline { + \begin{array}{cccccccccccccccccccc}{85{,}7}\\{\,\,4{,}2}\end{array}} \\\,\,\,\,89{,}9\end{array}$	$\begin{array}{l}\underline { + \begin{array}{cccccccccccccccccccc}{118{,}9}\\{\,\,\,\,\,\,5{,}1}\end{array}} \\\,\,\,\,124\end{array}$	$\begin{array}{l}\underline { + \begin{array}{cccccccccccccccccccc}{9{,}5}\\{7{,}2}\end{array}} \\\,16{,}7\end{array}$	$\begin{array}{l}\underline { + \begin{array}{cccccccccccccccccccc}{21{,}3}\\{\,\,3{,}7}\end{array}} \\\,\,\,25\end{array}$
$\begin{array}{l}\underline { + \begin{array}{cccccccccccccccccccc}{\,\,\,18{,}235}\\{2{,}9}\end{array}} \\\,\,\,\,\,\,\,21{,}135\end{array}$	$\begin{array}{l}\underline { + \begin{array}{cccccccccccccccccccc}{7{,}1}\\{6{,}6}\end{array}} \\\,13{,}7\end{array}$	$\begin{array}{l}\underline { + \begin{array}{cccccccccccccccccccc}{135{,}4}\\{\,\,\,\,\,4{,}2}\end{array}} \\\,\,\,\,139{,}6\end{array}$	$\begin{array}{l}\underline { + \begin{array}{cccccccccccccccccccc}{10{,}6}\\{64{,}4}\end{array}} \\\,\,\,\,75\end{array}$	$\begin{array}{l}\underline { + \begin{array}{cccccccccccccccccccc}{238{,}8}\\{\,\,\,\,\,\,1{,}2}\end{array}} \\\,\,\,\,240\end{array}$
$\begin{array}{l}\underline { + \begin{array}{cccccccccccccccccccc}{16{,}8}\\{\,\,3{,}1}\end{array}} \\\,\,\,19{,}9\end{array}$	$\begin{array}{l}\underline { + \begin{array}{cccccccccccccccccccc}{5{,}9}\\{7{,}2}\end{array}} \\\,\,13{,}1\end{array}$	$\begin{array}{l}\underline { + \begin{array}{cccccccccccccccccccc}{1{,}2}\\{5{,}5}\end{array}} \\\,\,\,6{,}7\end{array}$	$\begin{array}{l}\underline { + \begin{array}{cccccccccccccccccccc}{198{,}8}\\{\,\,\,\,4{,}2}\end{array}} \\\,\,\,203\end{array}$	$\begin{array}{l}\underline { + \begin{array}{cccccccccccccccccccc}{8{,}9}\\{6{,}1}\end{array}} \\\,15\end{array}$
$\begin{array}{l}\underline { + \begin{array}{cccccccccccccccccccc}{246{,}6}\\{\,\,\,\,\,2{,}4}\end{array}} \\\,\,\,\,249\end{array}$	$\begin{array}{l}\underline { + \begin{array}{cccccccccccccccccccc}{111{,}7}\\{\,\,\,\,6{,}3}\end{array}} \\\,\,\,118\end{array}$	$\begin{array}{l}\underline { + \begin{array}{cccccccccccccccccccc}{9{,}9}\\{5{,}1}\end{array}} \\\,\,15\end{array}$	$\begin{array}{l}\underline { + \begin{array}{cccccccccccccccccccc}{14{,}3}\\{\,\,7{,}6}\end{array}} \\\,\,\,\,21{,}9\end{array}$	$\begin{array}{l}\underline { + \begin{array}{cccccccccccccccccccc}{22{,}5}\\{\,\,3{,}5}\end{array}} \\\,\,\,\,26\end{array}$
$\begin{array}{l}\underline { + \begin{array}{cccccccccccccccccccc}{17{,}3}\\{\,\,6{,}6}\end{array}} \\\,\,\,23{,}9\end{array}$	$\begin{array}{l}\underline { + \begin{array}{cccccccccccccccccccc}{100{,}9}\\{\,\,\,\,\,7{,}1}\end{array}} \\\,\,\,\,108\end{array}$	$\begin{array}{l}\underline { + \begin{array}{cccccccccccccccccccc}{\,\,\,\,\,\,\,4{,}789}\\{2{,}3}\end{array}} \\\,\,\,\,\,\,\,\,\,\,7{,}089\end{array}$	$\begin{array}{l}\underline { + \begin{array}{cccccccccccccccccccc}{0{,}89}\\{6{,}54}\end{array}} \\\,\,\,\,7{,}43\end{array}$	$\begin{array}{l}\underline { + \begin{array}{cccccccccccccccccccc}{\,\,\,\,\,\,3{,}456}\\{1{,}2}\end{array}} \\\,\,\,\,\,\,\,\,\,4{,}656\end{array}$
$\begin{array}{l}\underline { + \begin{array}{cccccccccccccccccccc}{6{,}12}\\{2{,}78}\end{array}} \\\,\,\,\,8{,}9\end{array}$	$\begin{array}{l}\underline { + \begin{array}{cccccccccccccccccccc}{0{,}4}\\{\,\,\,\,8{,}345}\end{array}} \\\,\,\,\,\,\,\,\,8{,}745\end{array}$	$\begin{array}{l}\underline { + \begin{array}{cccccccccccccccccccc}{5{,}67}\\{1{,}89}\end{array}} \\\,\,\,7{,}56\end{array}$	$\begin{array}{l}\underline { + \begin{array}{cccccccccccccccccccc}{\,\,\,\,2{,}34}\\{4{,}5}\end{array}} \\\,\,\,\,\,\,\,6{,}84\end{array}$	$\begin{array}{l}\underline { + \begin{array}{cccccccccccccccccccc}{7{,}8}\\{\,\,\,\,\,0{,}567}\end{array}} \\\,\,\,\,\,\,\,\,\,8{,}367\end{array}$
$\begin{array}{l}\underline { + \begin{array}{cccccccccccccccccccc}{\,\,\,7{,}23}\\{1{,}8}\end{array}} \\\,\,\,\,\,\,\,9{,}03\end{array}$	$\begin{array}{l}\underline { + \begin{array}{cccccccccccccccccccc}{\,\,\,3{,}56}\\{5{,}2}\end{array}} \\\,\,\,\,\,\,\,8{,}76\end{array}$	$\begin{array}{l}\underline { + \begin{array}{cccccccccccccccccccc}{6{,}4}\\{\,\,\,\,\,0{,}789}\end{array}} \\\,\,\,\,\,\,\,\,\,7{,}189\end{array}$	$\begin{array}{l}\underline { + \begin{array}{cccccccccccccccccccc}{\,\,\,1{,}23}\\{7{,}6}\end{array}} \\\,\,\,\,\,\,8{,}83\end{array}$	$\begin{array}{l}\underline { + \begin{array}{cccccccccccccccccccc}{4{,}5}\\{\,\,\,3{,}21}\end{array}} \\\,\,\,\,\,\,\,7{,}71\end{array}$
$\begin{array}{l}\underline { + \begin{array}{cccccccccccccccccccc}{\,\,\,\,0{,}56}\\{9{,}1}\end{array}} \\\,\,\,\,\,\,\,\,9{,}66\end{array}$	$\begin{array}{l}\underline { + \begin{array}{cccccccccccccccccccc}{2{,}89}\\{6{,}34}\end{array}} \\\,\,\,\,9{,}23\end{array}$	$\begin{array}{l}\underline { + \begin{array}{cccccccccccccccccccc}{7{,}12}\\{1{,}45}\end{array}} \\\,\,\,\,8{,}57\end{array}$	$\begin{array}{l}\underline { + \begin{array}{cccccccccccccccccccc}{\,\,\,\,4{,}67}\\{3{,}8}\end{array}} \\\,\,\,\,\,\,\,\,8{,}47\end{array}$	$\begin{array}{l}\underline { + \begin{array}{cccccccccccccccccccc}{\,\,\,5{,}34}\\{2{,}9}\end{array}} \\\,\,\,\,\,\,\,8{,}24\end{array}$

Câu 2

Hướng dẫn chấm do TopStudy biên soạn, mang tính gợi ý

1,9 + 7,845 = 9,745 $\begin{array}{l}\underline { + \begin{array}{cccccccccccccccccccc}{1{,}9}\\{\,\,\,\,7{,}845}\end{array}} \\\,\,\,\,\,\,\,\,9{,}745\end{array}$	4,3 + 5,67 = 9,97 $\begin{array}{l}\underline { + \begin{array}{cccccccccccccccccccc}{4{,}3}\\{\,\,5{,}67}\end{array}} \\\,\,\,\,\,\,9{,}97\end{array}$	0,678 + 8,4 = 9,078 $\begin{array}{l}\underline { + \begin{array}{cccccccccccccccccccc}{\,\,\,\,\,\,0{,}678}\\{8{,}4}\end{array}} \\\,\,\,\,\,\,\,\,\,\,9{,}078\end{array}$
6,89 + 2,1 = 8,99 $\begin{array}{l}\underline { + \begin{array}{cccccccccccccccccccc}{\,\,\,\,6{,}89}\\{2{,}1}\end{array}} \\\,\,\,\,\,\,\,\,8{,}99\end{array}$	3,45 + 4,78 = 8,23 $\begin{array}{l}\underline { + \begin{array}{cccccccccccccccccccc}{3{,}45}\\{4{,}78}\end{array}} \\\,\,\,\,8{,}23\end{array}$	2,45 + 6,7 = 9,15 $\begin{array}{l}\underline { + \begin{array}{cccccccccccccccccccc}{\,\,\,2{,}45}\\{6{,}7}\end{array}} \\\,\,\,\,\,\,\,9{,}15\end{array}$
5,78 + 3,2 = 8,98 $\begin{array}{l}\underline { + \begin{array}{cccccccccccccccccccc}{\,\,\,5{,}78}\\{3{,}2}\end{array}} \\\,\,\,\,\,\,\,8{,}98\end{array}$	1,23 + 7,89 = 9,12 $\begin{array}{l}\underline { + \begin{array}{cccccccccccccccccccc}{1{,}23}\\{7{,}89}\end{array}} \\\,\,\,\,9{,}12\end{array}$	0,56 + 9,3 = 9,86 $\begin{array}{l}\underline { + \begin{array}{cccccccccccccccccccc}{\,\,\,0{,}56}\\{9{,}3}\end{array}} \\\,\,\,\,\,\,\,9{,}86\end{array}$
4,67 + 2,345 = 7,015 $\begin{array}{l}\underline { + \begin{array}{cccccccccccccccccccc}{4{,}67}\\{\,\,\,2{,}345}\end{array}} \\\,\,\,\,\,\,\,7{,}015\end{array}$	3,12 + 5,8 = 8,92 $\begin{array}{l}\underline { + \begin{array}{cccccccccccccccccccc}{\,\,\,3{,}12}\\{5{,}8}\end{array}} \\\,\,\,\,\,\,\,8{,}92\end{array}$	6,45 + 2,34 = 8,79 $\begin{array}{l}\underline { + \begin{array}{cccccccccccccccccccc}{6{,}45}\\{2{,}34}\end{array}} \\\,\,\,\,8{,}79\end{array}$

Câu 3

Hướng dẫn chấm do TopStudy biên soạn, mang tính gợi ý

4,56 + 5,2 = 9,76 $\begin{array}{l}\underline { + \begin{array}{cccccccccccccccccccc}{\,\,\,4{,}56}\\{5{,}2}\end{array}} \\\,\,\,\,\,\,\,9{,}76\end{array}$	7,12 + 1,89 = 9,01 $\begin{array}{l}\underline { + \begin{array}{cccccccccccccccccccc}{7{,}12}\\{1{,}89}\end{array}} \\\,\,\,9{,}01\end{array}$	3,45 + 6,78 = 10,23 $\begin{array}{l}\underline { + \begin{array}{cccccccccccccccccccc}{3{,}45}\\{6{,}78}\end{array}} \\\,\,10{,}23\end{array}$
0,789 + 8,7 = 9,489 $\begin{array}{l}\underline { + \begin{array}{cccccccccccccccccccc}{\,\,\,\,\,\,0{,}789}\\{8{,}7}\end{array}} \\\,\,\,\,\,\,\,\,\,\,9{,}489\end{array}$	1,23 + 7,45 = 8,68 $\begin{array}{l}\underline { + \begin{array}{cccccccccccccccccccc}{1{,}23}\\{7{,}45}\end{array}} \\\,\,\,\,8{,}68\end{array}$	5,78 + 2,34 = 8,12 $\begin{array}{l}\underline { + \begin{array}{cccccccccccccccccccc}{5{,}78}\\{2{,}34}\end{array}} \\\,\,\,\,\,8{,}12\end{array}$
1,45 + 8,6 = 10,05 $\begin{array}{l}\underline { + \begin{array}{cccccccccccccccccccc}{\,\,\,1{,}45}\\{8{,}6}\end{array}} \\\,\,\,\,10{,}05\end{array}$	4,67 + 5,12 = 9,79 $\begin{array}{l}\underline { + \begin{array}{cccccccccccccccccccc}{4{,}67}\\{5{,}12}\end{array}} \\\,\,\,\,9{,}79\end{array}$	7,9 + 0,567 = 8,467 $\begin{array}{l}\underline { + \begin{array}{cccccccccccccccccccc}{7{,}9}\\{\,\,\,\,\,0{,}567}\end{array}} \\\,\,\,\,\,\,\,\,\,8{,}467\end{array}$
2,89 + 6,3 = 9,19 $\begin{array}{l}\underline { + \begin{array}{cccccccccccccccccccc}{\,\,\,\,2{,}89}\\{6{,}3}\end{array}} \\\,\,\,\,\,\,\,\,9{,}19\end{array}$	6,89 + 1,2 = 8,09 $\begin{array}{l}\underline { + \begin{array}{cccccccccccccccccccc}{\,\,\,6{,}89}\\{1{,}2}\end{array}} \\\,\,\,\,\,\,\,8{,}09\end{array}$	0,78 + 9,34 = 10,12 $\begin{array}{l}\underline { + \begin{array}{cccccccccccccccccccc}{0{,}78}\\{9{,}34}\end{array}} \\\,\,10{,}12\end{array}$

Câu 4

Hướng dẫn chấm do TopStudy biên soạn, mang tính gợi ý

12,3 + 4,56 = 16,86	7,89 + 23,4 = 31,29
345,6 + 2,1 = 347,7	89,12 + 3,45 = 92,57
5,678 + 123,4 = 129,078	14,5 + 67,89 = 82,39
78,9 + 1,23 = 80,13	456,7 + 2,134 = 458,834
23,45 + 89,6 = 113,05	6,789 + 145,2 = 151,989
134,7 + 5,678 = 140,378	78,34 + 9,5 = 87,84
9,12 + 234,5 = 243,62	123,6 + 4,789 = 128,389
67,89 + 12,34 = 80,23	3,456 + 278,9 = 282,356
3,27 + 4,68 = 7,95	89,1 + 34,56 = 123,66
145,6 + 8,9 = 154,5	567,8 + 2,34 = 570,14
34,56 + 278,1 = 312,66	12,34 + 89,67 = 102,01
456,2 + 3,45 = 459,65	167,5 + 6,789 = 174,289
7,89 + 123,4 = 131,29	34,678 + 456,1 = 490,778
89,12 + 56,7 = 145,82	2,345 + 278,9 = 281,245
234,5 + 4,678 = 239,178	123,6 + 9,12 = 132,72
3,45 + 456,8 = 460,25	78,9 + 34,56 = 113,46

Câu 5

Hướng dẫn chấm do TopStudy biên soạn, mang tính gợi ý

8,12 + 34,5 = 42,62	123,4 + 6,789 = 130,189
456,7 + 1,23 = 457,93	9,56 + 78,9 = 88,46
3,456 + 145,2 = 148,656	67,8 + 23,45 = 91,25
78,9 + 12,34 = 91,24	4,35 + 5,76 = 10,11
123,6 + 5,12 = 128,72	5,43 + 2,19 = 7,62
9,78 + 234,5 = 244,28	34,12 + 67,89 = 102,01
567,1 + 2,345 = 569,445	89,4 + 12,56 = 101,96
23,45 + 78,9 = 102,35	145,2 + 6,123 = 151,323
1,234 + 456,8 = 458,034	5,67 + 234,1 = 239,77
34,56 + 123,7 = 158,26	78,9 + 9,456 = 88,356
145,3 + 6,789 = 152,089	456,1 + 2,34 = 458,44
5,678 + 234,9 = 240,578	12,34 + 89,6 = 101,94
67,89 + 12,3 = 80,19	234,7 + 1,234 = 235,934
189,1 + 5,45 = 194,55	3,456 + 345,8 = 349,256
4,12 + 456,7 = 460,82	56,78 + 89,1 = 145,88
23,67 + 78,9 = 102,57	123,5 + 4,678 = 128,178

Câu 6

Hướng dẫn chấm do TopStudy biên soạn, mang tính gợi ý

5,67 + 123,4 = 129,07	78,9 + 2,345 = 81,245
234,1 + 6,789 = 240,889	1,23 + 456,8 = 458,03
89,45 + 12,3 = 101,75	345,6 + 4,12 = 349,72
3,456 + 167,8 = 171,256	56,78 + 23,9 = 80,68
123,7 + 8,91 = 132,61	9,234 + 234,5 = 243,734
456,2 + 1,678 = 457,878	67,89 + 12,3 = 80,19
7,12 + 345,6 = 352,72	189,4 + 5,67 = 195,07
23,45 + 89,1 = 112,55	4,678 + 123,9 = 128,578
167,8 + 6,123 = 173,923	345,2 + 2,56 = 347,76
1,234 + 456,7 = 457,934	78,9 + 12,45 = 91,35

Câu 7

Hướng dẫn chấm do TopStudy biên soạn, mang tính gợi ý

1,56 + 8,37 = 9,93	45,6 + 2,134 = 47,734
234,5 + 1,23 = 235,73	8,912 + 167,8 = 176,712
12,345 + 56,7 = 69,045	345,1 + 4,67 = 349,77
89,6 + 3,456 = 93,056	1,78 + 234,9 = 236,68
456,2 + 5,67 = 461,87	67,123 + 12,3 = 79,423
3,12 + 189,5 = 192,62	6,24 + 3,75 = 9,99

Câu 8

Hướng dẫn chấm do TopStudy biên soạn, mang tính gợi ý

456,78 + 2,1 = 458,88	12,34 + 89,567 = 101,907
7,12 + 2,89 = 10,01	167,9 + 6,23 = 174,13
89,12 + 34,5 = 123,62	345,6 + 1,789 = 347,389
23,456 + 167,8 = 191,256	7,89 + 234,5 = 242,39
345,2 + 4,67 = 349,87	56,7 + 12,345 = 69,045
1,23 + 78,9 = 80,13	123,45 + 5,678 = 129,128

Câu 9

Hướng dẫn chấm do TopStudy biên soạn, mang tính gợi ý

3,45 + 167,8 = 171,25	89,12 + 6,789 = 95,909
456,7 + 2,13 = 458,83	12,5 + 234,67 = 247,17
78,9 + 5,678 = 84,578	345,2 + 1,234 = 346,434
23,67 + 123,4 = 147,07	7,89 + 56,12 = 64,01
189,5 + 4,56 = 194,06	134,78 + 3,45 = 138,23
6,123 + 345,9 = 352,023	23,456 + 78,9 = 102,356
2,97 + 7,14 = 10,11	167,8 + 5,67 = 173,47
56,78 + 89,1 = 145,88	4,678 + 123,45 = 128,128
345,6 + 1,789 = 347,389	89,34 + 6,12 = 95,46
7,89 + 456,2 = 464,09	12,345 + 167,5 = 179,845

Câu 10

Hướng dẫn chấm do TopStudy biên soạn, mang tính gợi ý

4,56 + 123,7 = 128,26	89,34 + 2,178 = 91,518
345,8 + 1,23 = 347,03	12,45 + 167,9 = 180,35
78,9 + 6,789 = 85,689	234,5 + 3,456 = 237,956
23,67 + 456,1 = 479,77	5,678 + 134,2 = 139,878
167,4 + 2,345 = 169,745	56,78 + 7,89 = 64,67
1,234 + 345,6 = 346,834	123,9 + 4,56 = 128,46
89,12 + 5,67 = 94,79	345,2 + 1,789 = 346,989
12,34 + 234,5 = 246,84	7,123 + 167,8 = 174,923
56,7 + 78,9 = 135,6	189,4 + 3,45 = 192,85
234,1 + 6,12 = 240,22	4,56 + 123,78 = 128,34
3,456 + 456,7 = 460,156	89,1 + 2,345 = 91,445
167,8 + 5,678 = 173,478	12,67 + 345,9 = 358,57
78,34 + 1,23 = 79,57	234,6 + 6,789 = 241,389
345,9 + 4,56 = 350,46	5,12 + 167,34 = 172,46
23,45 + 123,6 = 147,05	56,89 + 7,234 = 64,124
1,789 + 456,2 = 457,989	89,5 + 3,67 = 93,17