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