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