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