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