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