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