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