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