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