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