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