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