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