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