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