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