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