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