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