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