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