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