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