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