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