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