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