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