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