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