Oefen de erbijsommen tot 20
Erbijsommen
|
1.
1 + 12 =
7
3
2
13
|
2.
11 + 1 =
9
8
10
12
|
3.
1 + 16 =
7
1
17
5
|
4.
19 + 0 =
11
5
19
2
|
|
5.
11 + 1 =
14
4
12
17
|
6.
1 + 14 =
9
15
5
7
|
7.
12 + 2 =
19
15
14
6
|
8.
16 + 0 =
10
7
16
11
|
|
9.
9 + 8 =
17
1
2
5
|
10.
10 + 0 =
1
2
11
10
|
11.
13 + 2 =
3
7
5
15
|
12.
5 + 2 =
7
11
4
5
|
|
13.
16 + 2 =
12
10
8
18
|
14.
17 + 2 =
12
13
7
19
|
15.
14 + 4 =
8
13
9
18
|
16.
16 + 4 =
12
1
10
20
|
|
17.
1 + 11 =
8
17
12
10
|
18.
5 + 3 =
8
4
5
6
|
19.
4 + 6 =
14
10
8
11
|
20.
11 + 0 =
12
5
8
11
|