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