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