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