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