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Tiếng ViệtBox A
Box B
Box C
Box D
Box E
Geheugen
11
4
4
11
8
7
0
0
0
0
0
0
5
2
3
8
4
2
8
2
3
9
4
9
0
0
0
0
0
0
6
8
3
11
11
10
May 2024
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June
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September
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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
Sat, Mar 1
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April
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Box A
Box B
Box C
Box D
Box E
Geheugen
5
8
5
2
3
6
8
13
11
17
9
7
6
4
5
10
14
6
9
5
8
22
13
8
7
8
10
13
11
6
0
0
0
0
0
0
Box A
Box B
Box C
Box D
Box E
Geheugen
23
13
25
44
26
14
0
0
0
0
0
0
12
22
22
37
38
14
7
15
14
40
15
0
3
9
4
20
15
3
12
21
23
59
24
6
Box A
Box B
Box C
Box D
Box E
Geheugen
0
6
2
3
8
6
0
0
0
0
0
0
5
6
7
8
5
6
4
7
10
13
8
2
Box A
Box B
Box C
Box D
Box E
Geheugen
4
9
10
12
8
18
15
7
5
12
6
16
6
9
10
18
11
5
22
12
16
20
21
9
15
12
13
15
13
22
14
12
15
23
22
14
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 | B | D | C | B | C | A | B | A | A | C | |||||||||||
| 1 | E | B | A | A | C | B | B | D | D | D | D | C | D | B | D | D | C | D | B | B | |
| 2 | D | B | E | B | B | D | E | M | C | D | C | C | C | C | D | C | B | E | C | ||
| 3 | E | M | D | E | A | A | D | C | E | E | A | C | D | A | D | D | C | A | |||
| 4 | A | A | A | A | A | B | A | A | A | A | E | M | A | A | A | A | A | ||||
| 5 | C | B | B | B | B | B | A | B | C | B | A | B | A | B | E | B | |||||
| 6 | D | C | C | B | A | A | A | A | C | B | C | C | C | A | B | ||||||
| 7 | D | C | A | B | D | B | B | B | B | C | D | C | A | E | |||||||
| 8 | D | D | E | D | C | E | D | D | B | B | E | B | E | ||||||||
| 9 | D | A | E | D | A | E | D | A | E | A | M | A | |||||||||
| 10 | D | C | D | A | C | B | E | D | A | A | B | ||||||||||
| 11 | D | C | C | C | B | A | D | A | B | ||||||||||||
| 12 | A | D | D | C | D | A | A | C | |||||||||||||
| 13 | D | B | D | E | D | B | B | ||||||||||||||
| 14 | B | D | D | D | B | D | |||||||||||||||
| 15 | C | D | C | D | E | ||||||||||||||||
| 16 | C | B | A | C | |||||||||||||||||
| 17 | D | D | D | ||||||||||||||||||
| 18 | A | D | |||||||||||||||||||
| 19 | B | ||||||||||||||||||||
| 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 | B | D | C | B | C | A | B | A | A | C | |||||||||||
| 1 | E | B | A | A | C | B | B | D | D | D | D | C | D | B | D | D | C | D | B | B | |
| 2 | D | B | E | B | B | D | E | M | C | D | C | C | C | C | D | C | B | E | C | ||
| 3 | E | M | D | E | A | A | D | C | E | E | A | C | D | A | D | D | C | A | |||
| 4 | A | A | A | A | A | B | A | A | A | A | E | M | A | A | A | A | A | ||||
| 5 | C | B | B | B | B | B | A | B | C | B | A | B | A | B | E | B | |||||
| 6 | D | C | C | B | A | A | A | A | C | B | C | C | C | A | B | ||||||
| 7 | D | C | A | B | D | B | B | B | B | C | D | C | A | E | |||||||
| 8 | D | D | E | D | C | E | D | D | B | B | E | B | E | ||||||||
| 9 | D | A | E | D | A | E | D | A | E | A | M | A | |||||||||
| 10 | D | C | D | A | C | B | E | D | A | A | B | ||||||||||
| 11 | D | C | C | C | B | A | D | A | B | ||||||||||||
| 12 | A | D | D | C | D | A | A | C | |||||||||||||
| 13 | D | B | D | E | D | B | B | ||||||||||||||
| 14 | B | D | D | D | B | D | |||||||||||||||
| 15 | C | D | C | D | E | ||||||||||||||||
| 16 | C | B | A | C | |||||||||||||||||
| 17 | D | D | D | ||||||||||||||||||
| 18 | A | D | |||||||||||||||||||
| 19 | B | ||||||||||||||||||||
| 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 | E | A | |||||||||||||||||||
| 2 | M | D | C | ||||||||||||||||||
| 3 | A | C | M | E | |||||||||||||||||
| 4 | A | A | A | E | B | ||||||||||||||||
| 5 | A | A | C | B | B | B | |||||||||||||||
| 6 | B | B | C | B | C | A | C | ||||||||||||||
| 7 | E | D | A | D | D | B | D | B | |||||||||||||
| 8 | E | D | D | D | D | C | E | C | D | ||||||||||||
| 9 | A | D | A | D | A | D | A | D | D | E | |||||||||||
| 10 | C | A | D | D | B | D | D | D | C | C | E | ||||||||||
| 11 | C | A | A | C | B | D | B | C | E | A | |||||||||||
| 12 | C | A | B | B | B | D | D | A | B | B | B | ||||||||||
| 13 | A | D | D | C | C | E | D | A | D | E | C | D | |||||||||
| 14 | D | D | A | C | A | D | A | D | C | D | C | B | D | ||||||||
| 15 | B | B | A | D | B | B | D | D | C | A | A | A | D | D | |||||||
| 16 | B | D | D | D | D | C | B | B | B | B | A | B | D | C | A | ||||||
| 17 | B | E | D | D | C | B | A | B | B | B | B | A | D | A | B | D | |||||
| 18 | A | E | D | C | B | C | C | D | A | B | B | B | B | D | B | C | D | ||||
| 19 | C | D | C | B | B | C | B | C | E | D | C | B | D | C | A | D | B | D | |||
| 20 | C | D | B | D | E | C | E | D | E | D | D | D | D | C | E | D | E | E | D |
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 | E | A | |||||||||||||||||||
| 2 | M | D | C | ||||||||||||||||||
| 3 | A | C | M | E | |||||||||||||||||
| 4 | A | A | A | E | B | ||||||||||||||||
| 5 | A | A | C | B | B | B | |||||||||||||||
| 6 | B | B | C | B | C | A | C | ||||||||||||||
| 7 | E | D | A | D | D | B | D | B | |||||||||||||
| 8 | E | D | D | D | D | C | E | C | D | ||||||||||||
| 9 | A | D | A | D | A | D | A | D | D | E | |||||||||||
| 10 | C | A | D | D | B | D | D | D | C | C | E | ||||||||||
| 11 | C | A | A | C | B | D | B | C | E | A | |||||||||||
| 12 | C | A | B | B | B | D | D | A | B | B | B | ||||||||||
| 13 | A | D | D | C | C | E | D | A | D | E | C | D | |||||||||
| 14 | D | D | A | C | A | D | A | D | C | D | C | B | D | ||||||||
| 15 | B | B | A | D | B | B | D | D | C | A | A | A | D | D | |||||||
| 16 | B | D | D | D | D | C | B | B | B | B | A | B | D | C | A | ||||||
| 17 | B | E | D | D | C | B | A | B | B | B | B | A | D | A | B | D | |||||
| 18 | A | E | D | C | B | C | C | D | A | B | B | B | B | D | B | C | D | ||||
| 19 | C | D | C | B | B | C | B | C | E | D | C | B | D | C | A | D | B | D | |||
| 20 | C | D | B | D | E | C | E | D | E | D | D | D | D | C | E | D | E | E | D |
Need practiceMemory
| × | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
| 1 | B | D | B | D | E | C | B | |||||
| 2 | E | C | D | C | D | E | E | C | ||||
| 3 | M | E | C | A | E | M | D | M | E | E | ||
| 4 | E | M | D | B | A | M | M | A | D | A | ||
| 5 | C | B | B | B | B | C | E | B | B | A | C | B |
| 6 | C | D | C | B | D | C | C | |||||
| 7 | A | E | B | D | E | A | ||||||
| 8 | E | C | E | M | E | |||||||
| 9 | D | M | A | M | ||||||||
| 10 | D | B | D | |||||||||
| 11 | B | E | B | D | D | D | C | E | D | D | C | D |
| 12 | C | C | A | D | D | D | D | B | E | D | C | B |
Need practiceMemory
| ÷ | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| 1 | D | A | B | A | C | A | B | D | C | B |
| 2 | B | E | B | B | E | D | C | D | D | B |
| 3 | A | A | A | D | A | D | A | A | D | A |
| 4 | A | A | A | A | A | A | A | A | A | A |
| 5 | A | B | A | A | B | A | A | A | A | B |
| 6 | A | A | A | A | A | A | A | A | A | A |
| 7 | C | D | A | A | A | B | B | B | A | A |
| 8 | D | E | B | D | D | B | C | D | C | C |
| 9 | E | A | A | A | A | A | A | C | A | A |
| 10 | C | D | B | C | C | A | A | B | D | B |