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