Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
420 Cards in this Set
- Front
- Back
0 + 1 = ?
|
1
|
|
0 + 2 = ?
|
2
|
|
0 + 3 = ?
|
3
|
|
0 + 4 = ?
|
4
|
|
0 + 5 = ?
|
5
|
|
0 + 6 = ?
|
6
|
|
0 + 7 = ?
|
7
|
|
0 + 8 = ?
|
8
|
|
0 + 9 = ?
|
9
|
|
0 + 10 = ?
|
10
|
|
0 + 11 = ?
|
11
|
|
0 + 12 = ?
|
12
|
|
0 + 13 = ?
|
13
|
|
0 + 14 = ?
|
14
|
|
0 + 15 = ?
|
15
|
|
0 + 16 = ?
|
16
|
|
0 + 17 = ?
|
17
|
|
0 + 18 = ?
|
18
|
|
0 + 19 = ?
|
19
|
|
0 + 20 = ?
|
20
|
|
1 + 1 = ?
|
2
|
|
1 + 2 = ?
|
3
|
|
1 + 3 = ?
|
4
|
|
1 + 4 = ?
|
5
|
|
1 + 5 = ?
|
6
|
|
1 + 6 = ?
|
7
|
|
1 + 7 = ?
|
8
|
|
1 + 8 = ?
|
9
|
|
1 + 9 = ?
|
10
|
|
1 + 10 = ?
|
11
|
|
1 + 11 = ?
|
12
|
|
1 + 12 = ?
|
13
|
|
1 + 13 = ?
|
14
|
|
1 + 14 = ?
|
15
|
|
1 + 15 = ?
|
16
|
|
1 + 16 = ?
|
17
|
|
1 + 17 = ?
|
18
|
|
1 + 18 = ?
|
19
|
|
1 + 19 = ?
|
20
|
|
2 + 1 = ?
|
3
|
|
2 + 2 = ?
|
4
|
|
2 + 3 = ?
|
5
|
|
2 + 4 = ?
|
6
|
|
2 + 5 = ?
|
7
|
|
2 + 6 = ?
|
8
|
|
2 + 7 = ?
|
9
|
|
2 + 8 = ?
|
10
|
|
2 + 9 = ?
|
11
|
|
2 + 10 = ?
|
12
|
|
2 + 11 = ?
|
13
|
|
2 + 12 = ?
|
14
|
|
2 + 13 = ?
|
15
|
|
2 + 14 = ?
|
16
|
|
2 + 15 = ?
|
17
|
|
2 + 16 = ?
|
18
|
|
2 + 17 = ?
|
19
|
|
2 + 18 = ?
|
20
|
|
3 + 1 = ?
|
4
|
|
3 + 2 = ?
|
5
|
|
3 + 3 = ?
|
6
|
|
3 + 4 = ?
|
7
|
|
3 + 5 = ?
|
8
|
|
3 + 6 = ?
|
9
|
|
3 + 7 = ?
|
10
|
|
3 + 8 = ?
|
11
|
|
3 + 9 = ?
|
12
|
|
3 + 10 = ?
|
13
|
|
3 + 11 = ?
|
14
|
|
3 + 12 = ?
|
15
|
|
3 + 13 = ?
|
16
|
|
3 + 14 = ?
|
17
|
|
3 + 15 = ?
|
18
|
|
3 + 16 = ?
|
19
|
|
3 + 17 = ?
|
20
|
|
4 + 1 = ?
|
5
|
|
4 + 2 = ?
|
6
|
|
4 + 3 = ?
|
7
|
|
4 + 4 = ?
|
8
|
|
4 + 5 = ?
|
9
|
|
4 + 6 = ?
|
10
|
|
4 + 7 = ?
|
11
|
|
4 + 8 = ?
|
12
|
|
4 + 9 = ?
|
13
|
|
4 + 10 = ?
|
14
|
|
4 + 11 = ?
|
15
|
|
4 + 12 = ?
|
16
|
|
4 + 13 = ?
|
17
|
|
4 + 14 = ?
|
18
|
|
4 + 15 = ?
|
19
|
|
4 + 16 = ?
|
20
|
|
5 + 1 = ?
|
6
|
|
5 + 2 = ?
|
7
|
|
5 + 3 = ?
|
8
|
|
5 + 4 = ?
|
9
|
|
5 + 5 = ?
|
10
|
|
5 + 6 = ?
|
11
|
|
5 + 7 = ?
|
12
|
|
5 + 8 = ?
|
13
|
|
5 + 9 = ?
|
14
|
|
5 + 10 = ?
|
15
|
|
5 + 11 = ?
|
16
|
|
5 + 12 = ?
|
17
|
|
5 + 13 = ?
|
18
|
|
5 + 14 = ?
|
19
|
|
5 + 15 = ?
|
20
|
|
6 + 1 = ?
|
7
|
|
6 + 2 = ?
|
8
|
|
6 + 3 = ?
|
9
|
|
6 + 4 = ?
|
10
|
|
6 + 5 = ?
|
11
|
|
6 + 6 = ?
|
12
|
|
6 + 7 = ?
|
13
|
|
6 + 8 = ?
|
14
|
|
6 + 9 = ?
|
15
|
|
6 + 10 = ?
|
16
|
|
6 + 11 = ?
|
17
|
|
6 + 12 = ?
|
18
|
|
6 + 13 = ?
|
19
|
|
6 + 14 = ?
|
20
|
|
7 + 1 = ?
|
8
|
|
7 + 2 = ?
|
9
|
|
7 + 3 = ?
|
10
|
|
7 + 4 = ?
|
11
|
|
7 + 5 = ?
|
12
|
|
7 + 6 = ?
|
13
|
|
7 + 7 = ?
|
14
|
|
7 + 8 = ?
|
15
|
|
7 + 9 = ?
|
16
|
|
7 + 10 = ?
|
17
|
|
7 + 11 = ?
|
18
|
|
7 + 12 = ?
|
19
|
|
7 + 13 = ?
|
20
|
|
8 + 1 = ?
|
9
|
|
8 + 2 = ?
|
10
|
|
8 + 3 = ?
|
11
|
|
8 + 4 = ?
|
12
|
|
8 + 5 = ?
|
13
|
|
8 + 6 = ?
|
14
|
|
8 + 7 = ?
|
15
|
|
8 + 8 = ?
|
16
|
|
8 + 9 = ?
|
17
|
|
8 + 10 = ?
|
18
|
|
8 + 11 = ?
|
19
|
|
8 + 12 = ?
|
20
|
|
9 + 1 = ?
|
10
|
|
9 + 2 = ?
|
11
|
|
9 + 3 = ?
|
12
|
|
9 + 4 = ?
|
13
|
|
9 + 5 = ?
|
14
|
|
9 + 6 = ?
|
15
|
|
9 + 7 = ?
|
16
|
|
9 + 8 = ?
|
17
|
|
9 + 9 = ?
|
18
|
|
9 + 10 = ?
|
19
|
|
9 + 11 = ?
|
20
|
|
10 + 1 = ?
|
11
|
|
10 + 2 = ?
|
12
|
|
10 + 3 = ?
|
13
|
|
10 + 4 = ?
|
14
|
|
10 + 5 = ?
|
15
|
|
10 + 6 = ?
|
16
|
|
10 + 7 = ?
|
17
|
|
10 + 8 = ?
|
18
|
|
10 + 9 = ?
|
19
|
|
10 + 10 = ?
|
20
|
|
11 + 1 = ?
|
12
|
|
11 + 2 = ?
|
13
|
|
11 + 3 = ?
|
14
|
|
11 + 4 = ?
|
15
|
|
11 + 5 = ?
|
16
|
|
11 + 6 = ?
|
17
|
|
11 + 7 = ?
|
18
|
|
11 + 8 = ?
|
19
|
|
11 + 9 = ?
|
20
|
|
12 + 1 = ?
|
13
|
|
12 + 2 = ?
|
14
|
|
12 + 3 = ?
|
15
|
|
12 + 4 = ?
|
16
|
|
12 + 5 = ?
|
17
|
|
12 + 6 = ?
|
18
|
|
12 + 7 = ?
|
19
|
|
12 + 8 = ?
|
20
|
|
13 + 1 = ?
|
14
|
|
13 + 2 = ?
|
15
|
|
13 + 3 = ?
|
16
|
|
13 + 4 = ?
|
17
|
|
13 + 5 = ?
|
18
|
|
13 + 6 = ?
|
19
|
|
13 + 7 = ?
|
20
|
|
14 + 1 = ?
|
15
|
|
14 + 2 = ?
|
16
|
|
14 + 3 = ?
|
17
|
|
14 + 4 = ?
|
18
|
|
14 + 5 = ?
|
19
|
|
14 + 6 = ?
|
20
|
|
15 + 1 = ?
|
16
|
|
15 + 2 = ?
|
17
|
|
15 + 3 = ?
|
18
|
|
15 + 4 = ?
|
19
|
|
15 + 5 = ?
|
20
|
|
16 + 1 = ?
|
17
|
|
16 + 2 = ?
|
18
|
|
16 + 3 = ?
|
19
|
|
16 + 4 = ?
|
20
|
|
17 + 1 = ?
|
18
|
|
17 + 2 = ?
|
19
|
|
17 + 3 = ?
|
20
|
|
18 + 1 = ?
|
19
|
|
18 + 2 = ?
|
20
|
|
19 + 1 = ?
|
20
|
|
1 + 0 = ?
|
1
|
|
2 + 0 = ?
|
2
|
|
3 + 0 = ?
|
3
|
|
4 + 0 = ?
|
4
|
|
5 + 0 = ?
|
5
|
|
6 + 0 = ?
|
6
|
|
7 + 0 = ?
|
7
|
|
8 + 0 = ?
|
8
|
|
9 + 0 = ?
|
9
|
|
10 + 0 = ?
|
10
|
|
11 + 0 = ?
|
11
|
|
12 + 0 = ?
|
12
|
|
13 + 0 = ?
|
13
|
|
14 + 0 = ?
|
14
|
|
15 + 0 = ?
|
15
|
|
16 + 0 = ?
|
16
|
|
17 + 0 = ?
|
17
|
|
18 + 0 = ?
|
18
|
|
19 + 0 = ?
|
19
|
|
20 + 0 = ?
|
20
|
|
1 + 1 = ?
|
2
|
|
2 + 1 = ?
|
3
|
|
3 + 1 = ?
|
4
|
|
4 + 1 = ?
|
5
|
|
5 + 1 = ?
|
6
|
|
6 + 1 = ?
|
7
|
|
7 + 1 = ?
|
8
|
|
8 + 1 = ?
|
9
|
|
9 + 1 = ?
|
10
|
|
10 + 1 = ?
|
11
|
|
11 + 1 = ?
|
12
|
|
12 + 1 = ?
|
13
|
|
13 + 1 = ?
|
14
|
|
14 + 1 = ?
|
15
|
|
15 + 1 = ?
|
16
|
|
16 + 1 = ?
|
17
|
|
17 + 1 = ?
|
18
|
|
18 + 1 = ?
|
19
|
|
19 + 1 = ?
|
20
|
|
1 + 2 = ?
|
3
|
|
2 + 2 = ?
|
4
|
|
3 + 2 = ?
|
5
|
|
4 + 2 = ?
|
6
|
|
5 + 2 = ?
|
7
|
|
6 + 2 = ?
|
8
|
|
7 + 2 = ?
|
9
|
|
8 + 2 = ?
|
10
|
|
9 + 2 = ?
|
11
|
|
10 + 2 = ?
|
12
|
|
11 + 2 = ?
|
13
|
|
12 + 2 = ?
|
14
|
|
13 + 2 = ?
|
15
|
|
14 + 2 = ?
|
16
|
|
15 + 2 = ?
|
17
|
|
16 + 2 = ?
|
18
|
|
17 + 2 = ?
|
19
|
|
18 + 2 = ?
|
20
|
|
1 + 3 = ?
|
4
|
|
2 + 3 = ?
|
5
|
|
3 + 3 = ?
|
6
|
|
4 + 3 = ?
|
7
|
|
5 + 3 = ?
|
8
|
|
6 + 3 = ?
|
9
|
|
7 + 3 = ?
|
10
|
|
8 + 3 = ?
|
11
|
|
9 + 3 = ?
|
12
|
|
10 + 3 = ?
|
13
|
|
11 + 3 = ?
|
14
|
|
12 + 3 = ?
|
15
|
|
13 + 3 = ?
|
16
|
|
14 + 3 = ?
|
17
|
|
15 + 3 = ?
|
18
|
|
16 + 3 = ?
|
19
|
|
17 + 3 = ?
|
20
|
|
1 + 4 = ?
|
5
|
|
2 + 4 = ?
|
6
|
|
3 + 4 = ?
|
7
|
|
4 + 4 = ?
|
8
|
|
5 + 4 = ?
|
9
|
|
6 + 4 = ?
|
10
|
|
7 + 4 = ?
|
11
|
|
8 + 4 = ?
|
12
|
|
9 + 4 = ?
|
13
|
|
10 + 4 = ?
|
14
|
|
11 + 4 = ?
|
15
|
|
12 + 4 = ?
|
16
|
|
13 + 4 = ?
|
17
|
|
14 + 4 = ?
|
18
|
|
15 + 4 = ?
|
19
|
|
16 + 4 = ?
|
20
|
|
1 + 5 = ?
|
6
|
|
2 + 5 = ?
|
7
|
|
3 + 5 = ?
|
8
|
|
4 + 5 = ?
|
9
|
|
5 + 5 = ?
|
10
|
|
6 + 5 = ?
|
11
|
|
7 + 5 = ?
|
12
|
|
8 + 5 = ?
|
13
|
|
9 + 5 = ?
|
14
|
|
10 + 5 = ?
|
15
|
|
11 + 5 = ?
|
16
|
|
12 + 5 = ?
|
17
|
|
13 + 5 = ?
|
18
|
|
14 + 5 = ?
|
19
|
|
15 + 5 = ?
|
20
|
|
1 + 6 = ?
|
7
|
|
2 + 6 = ?
|
8
|
|
3 + 6 = ?
|
9
|
|
4 + 6 = ?
|
10
|
|
5 + 6 = ?
|
11
|
|
6 + 6 = ?
|
12
|
|
7 + 6 = ?
|
13
|
|
8 + 6 = ?
|
14
|
|
9 + 6 = ?
|
15
|
|
10 + 6 = ?
|
16
|
|
11 + 6 = ?
|
17
|
|
12 + 6 = ?
|
18
|
|
13 + 6 = ?
|
19
|
|
14 + 6 = ?
|
20
|
|
1 + 7 = ?
|
8
|
|
2 + 7 = ?
|
9
|
|
3 + 7 = ?
|
10
|
|
4 + 7 = ?
|
11
|
|
5 + 7 = ?
|
12
|
|
6 + 7 = ?
|
13
|
|
7 + 7 = ?
|
14
|
|
8 + 7 = ?
|
15
|
|
9 + 7 = ?
|
16
|
|
10 + 7 = ?
|
17
|
|
11 + 7 = ?
|
18
|
|
12 + 7 = ?
|
19
|
|
13 + 7 = ?
|
20
|
|
1 + 8 = ?
|
9
|
|
2 + 8 = ?
|
10
|
|
3 + 8 = ?
|
11
|
|
4 + 8 = ?
|
12
|
|
5 + 8 = ?
|
13
|
|
6 + 8 = ?
|
14
|
|
7 + 8 = ?
|
15
|
|
8 + 8 = ?
|
16
|
|
9 + 8 = ?
|
17
|
|
10 + 8 = ?
|
18
|
|
11 + 8 = ?
|
19
|
|
12 + 8 = ?
|
20
|
|
1 + 9 = ?
|
10
|
|
2 + 9 = ?
|
11
|
|
3 + 9 = ?
|
12
|
|
4 + 9 = ?
|
13
|
|
5 + 9 = ?
|
14
|
|
6 + 9 = ?
|
15
|
|
7 + 9 = ?
|
16
|
|
8 + 9 = ?
|
17
|
|
9 + 9 = ?
|
18
|
|
10 + 9 = ?
|
19
|
|
11 + 9 = ?
|
20
|
|
1 + 10 = ?
|
11
|
|
2 + 10 = ?
|
12
|
|
3 + 10 = ?
|
13
|
|
4 + 10 = ?
|
14
|
|
5 + 10 = ?
|
15
|
|
6 + 10 = ?
|
16
|
|
7 + 10 = ?
|
17
|
|
8 + 10 = ?
|
18
|
|
9 + 10 = ?
|
19
|
|
10 + 10 = ?
|
20
|
|
1 + 11 = ?
|
12
|
|
2 + 11 = ?
|
13
|
|
3 + 11 = ?
|
14
|
|
4 + 11 = ?
|
15
|
|
5 + 11 = ?
|
16
|
|
6 + 11 = ?
|
17
|
|
7 + 11 = ?
|
18
|
|
8 + 11 = ?
|
19
|
|
9 + 11 = ?
|
20
|
|
1 + 12 = ?
|
13
|
|
2 + 12 = ?
|
14
|
|
3 + 12 = ?
|
15
|
|
4 + 12 = ?
|
16
|
|
5 + 12 = ?
|
17
|
|
6 + 12 = ?
|
18
|
|
7 + 12 = ?
|
19
|
|
8 + 12 = ?
|
20
|
|
1 + 13 = ?
|
14
|
|
2 + 13 = ?
|
15
|
|
3 + 13 = ?
|
16
|
|
4 + 13 = ?
|
17
|
|
5 + 13 = ?
|
18
|
|
6 + 13 = ?
|
19
|
|
7 + 13 = ?
|
20
|
|
1 + 14 = ?
|
15
|
|
2 + 14 = ?
|
16
|
|
3 + 14 = ?
|
17
|
|
4 + 14 = ?
|
18
|
|
5 + 14 = ?
|
19
|
|
6 + 14 = ?
|
20
|
|
1 + 15 = ?
|
16
|
|
2 + 15 = ?
|
17
|
|
3 + 15 = ?
|
18
|
|
4 + 15 = ?
|
19
|
|
5 + 15 = ?
|
20
|
|
1 + 16 = ?
|
17
|
|
2 + 16 = ?
|
18
|
|
3 + 16 = ?
|
19
|
|
4 + 16 = ?
|
20
|
|
1 + 17 = ?
|
18
|
|
2 + 17 = ?
|
19
|
|
3 + 17 = ?
|
20
|
|
1 + 18 = ?
|
19
|
|
2 + 18 = ?
|
20
|
|
1 + 19 = ?
|
20
|