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