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