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