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