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