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