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