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