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