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