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