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