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