Oefen de erbijsom en erafsom tot 12
In de mix
|
1.
5 + 4 =
9
1
|
2.
1 + 9 =
1
10
|
3.
11 + 1 =
1
12
|
4.
2 + 10 =
1
12
|
|
5.
4 – 4 =
0
2
|
6.
12 – 10 =
2
1
|
7.
9 – 3 =
6
1
|
8.
9 + 3 =
1
12
|
|
9.
9 + 0 =
9
1
|
10.
12 – 0 =
1
12
|
11.
8 – 7 =
2
1
|
12.
1 + 1 =
1
2
|
|
13.
11 – 9 =
2
1
|
14.
5 – 2 =
1
3
|
15.
8 + 3 =
11
1
|
16.
2 – 0 =
2
1
|
|
17.
9 – 9 =
2
0
|
18.
10 – 2 =
8
1
|
19.
6 + 0 =
1
6
|
20.
10 – 9 =
2
1
|