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