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