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