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