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