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Tiếng ViệtBox A
Box B
Box C
Box D
Box E
Memory
11
4
4
11
8
7
0
0
0
0
0
0
4
5
2
5
6
2
6
4
3
8
8
6
0
0
0
0
0
0
5
7
9
12
6
10
May 2024
Wed, May 1
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June
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October
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November
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December
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January 2025
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February
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March
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April
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Box A
Box B
Box C
Box D
Box E
Memory
4
5
9
5
2
4
7
9
11
12
16
10
4
6
8
10
7
10
5
8
13
14
16
9
7
6
11
13
10
8
0
0
0
0
0
0
Box A
Box B
Box C
Box D
Box E
Memory
17
20
25
40
24
19
0
0
0
0
0
0
17
23
24
46
21
14
7
15
15
38
16
0
2
8
6
22
14
2
8
25
26
54
29
3
Box A
Box B
Box C
Box D
Box E
Memory
5
5
2
4
3
6
0
0
0
0
0
0
7
1
6
6
10
7
6
5
3
18
11
1
Box A
Box B
Box C
Box D
Box E
Memory
6
3
12
10
14
16
8
8
10
9
16
10
4
10
10
14
13
8
18
12
17
18
18
17
10
12
13
18
20
17
12
15
23
19
16
15
Addition
Need practiceMemory
| + | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 |
| 0 | C | A | M | M | C | C | A | C | C | C | |||||||||||
| 1 | B | B | C | A | B | B | C | C | D | A | C | B | C | D | C | C | B | C | C | D | |
| 2 | E | E | B | C | D | C | C | E | E | B | C | D | B | E | D | B | C | E | M | ||
| 3 | E | D | D | D | C | M | D | D | M | D | A | D | E | A | M | A | A | A | |||
| 4 | E | A | A | A | B | B | A | M | A | A | A | B | A | A | A | A | A | ||||
| 5 | B | B | B | B | B | A | A | B | B | C | E | B | A | B | C | B | |||||
| 6 | A | B | C | B | C | A | C | A | A | C | B | C | C | D | B | ||||||
| 7 | E | D | A | A | B | B | A | C | E | D | C | C | A | B | |||||||
| 8 | M | E | E | C | E | E | B | C | B | E | D | E | C | ||||||||
| 9 | D | M | C | D | M | M | D | C | D | D | E | A | |||||||||
| 10 | E | D | C | D | D | C | D | D | B | D | C | ||||||||||
| 11 | C | C | B | C | B | D | B | C | A | ||||||||||||
| 12 | A | D | A | D | A | A | C | B | |||||||||||||
| 13 | D | E | B | B | D | A | B | ||||||||||||||
| 14 | A | B | B | D | A | D | |||||||||||||||
| 15 | D | B | C | B | D | ||||||||||||||||
| 16 | B | B | C | B | |||||||||||||||||
| 17 | A | D | C | ||||||||||||||||||
| 18 | B | C | |||||||||||||||||||
| 19 | D | ||||||||||||||||||||
| 20 |
Addition
Need practiceMemory
| + | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 |
| 0 | C | A | M | M | C | C | A | C | C | C | |||||||||||
| 1 | B | B | C | A | B | B | C | C | D | A | C | B | C | D | C | C | B | C | C | D | |
| 2 | E | E | B | C | D | C | C | E | E | B | C | D | B | E | D | B | C | E | M | ||
| 3 | E | D | D | D | C | M | D | D | M | D | A | D | E | A | M | A | A | A | |||
| 4 | E | A | A | A | B | B | A | M | A | A | A | B | A | A | A | A | A | ||||
| 5 | B | B | B | B | B | A | A | B | B | C | E | B | A | B | C | B | |||||
| 6 | A | B | C | B | C | A | C | A | A | C | B | C | C | D | B | ||||||
| 7 | E | D | A | A | B | B | A | C | E | D | C | C | A | B | |||||||
| 8 | M | E | E | C | E | E | B | C | B | E | D | E | C | ||||||||
| 9 | D | M | C | D | M | M | D | C | D | D | E | A | |||||||||
| 10 | E | D | C | D | D | C | D | D | B | D | C | ||||||||||
| 11 | C | C | B | C | B | D | B | C | A | ||||||||||||
| 12 | A | D | A | D | A | A | C | B | |||||||||||||
| 13 | D | E | B | B | D | A | B | ||||||||||||||
| 14 | A | B | B | D | A | D | |||||||||||||||
| 15 | D | B | C | B | D | ||||||||||||||||
| 16 | B | B | C | B | |||||||||||||||||
| 17 | A | D | C | ||||||||||||||||||
| 18 | B | C | |||||||||||||||||||
| 19 | D | ||||||||||||||||||||
| 20 |
Subtraction
Need practiceMemory
| – | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 |
| 0 | |||||||||||||||||||||
| 1 | C | C | |||||||||||||||||||
| 2 | B | B | C | ||||||||||||||||||
| 3 | M | A | C | D | |||||||||||||||||
| 4 | E | A | A | A | A | ||||||||||||||||
| 5 | A | B | B | A | E | C | |||||||||||||||
| 6 | B | B | A | C | C | C | B | ||||||||||||||
| 7 | D | C | D | D | D | C | C | D | |||||||||||||
| 8 | M | C | C | E | E | E | B | D | B | ||||||||||||
| 9 | M | A | C | E | A | E | A | D | D | E | |||||||||||
| 10 | D | D | D | B | D | D | B | B | D | C | B | ||||||||||
| 11 | B | B | B | B | B | D | A | B | C | D | |||||||||||
| 12 | A | D | B | C | D | B | D | D | D | A | D | ||||||||||
| 13 | C | D | C | C | C | D | B | B | C | D | C | B | |||||||||
| 14 | A | B | B | B | D | B | B | D | A | D | A | D | B | ||||||||
| 15 | D | C | C | D | D | B | A | B | D | C | D | D | A | B | |||||||
| 16 | A | D | D | C | C | D | D | D | D | D | D | A | D | C | B | ||||||
| 17 | B | D | A | D | B | D | B | D | C | D | A | D | B | A | C | D | |||||
| 18 | D | D | E | C | D | D | C | E | B | B | C | D | B | B | B | A | C | ||||
| 19 | B | B | D | C | E | B | D | B | D | A | D | A | B | C | B | D | C | A | |||
| 20 | E | B | C | E | E | C | D | E | B | E | D | C | B | C | B | B | M | D | E |
Subtraction
Need practiceMemory
| – | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 |
| 0 | |||||||||||||||||||||
| 1 | C | C | |||||||||||||||||||
| 2 | B | B | C | ||||||||||||||||||
| 3 | M | A | C | D | |||||||||||||||||
| 4 | E | A | A | A | A | ||||||||||||||||
| 5 | A | B | B | A | E | C | |||||||||||||||
| 6 | B | B | A | C | C | C | B | ||||||||||||||
| 7 | D | C | D | D | D | C | C | D | |||||||||||||
| 8 | M | C | C | E | E | E | B | D | B | ||||||||||||
| 9 | M | A | C | E | A | E | A | D | D | E | |||||||||||
| 10 | D | D | D | B | D | D | B | B | D | C | B | ||||||||||
| 11 | B | B | B | B | B | D | A | B | C | D | |||||||||||
| 12 | A | D | B | C | D | B | D | D | D | A | D | ||||||||||
| 13 | C | D | C | C | C | D | B | B | C | D | C | B | |||||||||
| 14 | A | B | B | B | D | B | B | D | A | D | A | D | B | ||||||||
| 15 | D | C | C | D | D | B | A | B | D | C | D | D | A | B | |||||||
| 16 | A | D | D | C | C | D | D | D | D | D | D | A | D | C | B | ||||||
| 17 | B | D | A | D | B | D | B | D | C | D | A | D | B | A | C | D | |||||
| 18 | D | D | E | C | D | D | C | E | B | B | C | D | B | B | B | A | C | ||||
| 19 | B | B | D | C | E | B | D | B | D | A | D | A | B | C | B | D | C | A | |||
| 20 | E | B | C | E | E | C | D | E | B | E | D | C | B | C | B | B | M | D | E |
Need practiceMemory
| × | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
| 1 | C | B | D | D | D | D | E | |||||
| 2 | B | E | C | D | E | E | C | D | ||||
| 3 | A | M | E | M | D | E | M | A | E | M | ||
| 4 | E | B | A | A | A | A | A | A | B | D | ||
| 5 | B | A | B | M | E | E | B | C | C | C | A | A |
| 6 | A | C | A | M | D | A | A | |||||
| 7 | D | C | D | A | E | E | ||||||
| 8 | E | D | E | E | E | |||||||
| 9 | M | E | E | E | ||||||||
| 10 | D | E | D | |||||||||
| 11 | E | C | D | D | D | D | A | A | D | C | B | B |
| 12 | B | E | D | D | D | D | D | D | B | D | D | D |
Need practiceMemory
| ÷ | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| 1 | C | B | A | B | B | A | C | D | D | C |
| 2 | E | D | C | C | E | C | B | C | E | C |
| 3 | A | A | D | A | A | A | A | A | D | C |
| 4 | A | A | A | B | A | A | A | A | A | A |
| 5 | B | B | B | A | B | B | B | B | A | A |
| 6 | A | C | B | A | A | B | A | B | B | A |
| 7 | B | A | A | B | A | A | C | B | D | C |
| 8 | D | C | C | C | B | C | C | C | C | C |
| 9 | C | A | D | A | A | A | A | E | D | C |
| 10 | B | D | A | A | B | B | C | B | A | B |