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