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