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