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