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