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