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