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