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