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