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