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