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