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