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