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