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