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