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