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