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