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