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