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